Debt (Narrative) (Details)
$ / shares in Units, $ in Millions |
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3 Months Ended |
9 Months Ended |
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|
Sep. 14, 2016
USD ($)
day
$ / shares
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Sep. 24, 2016
USD ($)
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Sep. 24, 2016
USD ($)
|
Sep. 26, 2015
USD ($)
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Sep. 28, 2016
USD ($)
|
Sep. 23, 2016
$ / shares
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| Debt Instrument [Line Items] |
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| Share price (in usd per share) | $ / shares |
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$ 6.55
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| Gain (Loss) on Extinguishment of Debt |
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|
$ (61)
|
$ 0
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| Convertible Debt | 2.125% Convertible Senior Notes due 2026 |
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| Debt Instrument [Line Items] |
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| Principal |
$ 700
|
$ 700
|
700
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| Debt Instrument, Interest Rate, Stated Percentage |
2.125%
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| Debt Instrument, Convertible, Conversion Ratio |
0.1250031
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| Debt Instrument, Convertible, Conversion Price | $ / shares |
$ 8.00
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| Debt Issuance Cost, Gross, Noncurrent |
|
12
|
12
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| Equity issuance costs |
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$ 8
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$ 8
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| Debt Instrument, Convertible, Remaining Life |
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120 months
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| Debt Instrument, Interest Rate, Effective Percentage |
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8.00%
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8.00%
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| Convertible Debt | 2.125% Convertible Senior Notes due 2026 | Debt Instrument, Conversion Circumstance 1 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Convertible, Threshold Trading Days | day |
20
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| Debt Instrument, Convertible, Threshold Consecutive Trading Days |
30 days
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| Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |
130.00%
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| Convertible Debt | 2.125% Convertible Senior Notes due 2026 | Debt Instrument, Conversion Circumstance 2 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Convertible, Threshold Consecutive Trading Days |
10 days
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| Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |
98.00%
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| Debt Instrument, Convertible, Conversion Period After Threshold Period Days | day |
5
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| Convertible Debt | 2.125% Convertible Senior Notes Due 2026, Over-Allotment Option | Subsequent Event |
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| Debt Instrument [Line Items] |
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| Principal |
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$ 105
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| Senior Notes | 6.75% Senior Notes due 2019 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Interest Rate, Stated Percentage |
|
6.75%
|
6.75%
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| Debt Instrument, Repurchased Face Amount |
|
$ 404
|
$ 404
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| Early Repayment of Senior Debt |
|
442
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| Interest Paid |
|
2
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| Gain (Loss) on Extinguishment of Debt |
|
(41)
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| Outstanding Aggregate Principal Amount |
|
$ 196
|
$ 196
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| Senior Notes | 7.75% Senior Notes due 2020 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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7.75%
|
7.75%
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| Debt Instrument, Repurchased Face Amount |
|
$ 242
|
$ 242
|
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| Early Repayment of Senior Debt |
|
251
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| Interest Paid |
|
3
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| Gain (Loss) on Extinguishment of Debt |
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(9)
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| Outstanding Aggregate Principal Amount |
|
$ 208
|
$ 208
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| Senior Notes | 7.75% Senior Notes due 2020 | Subsequent Event |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Repurchased Face Amount |
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$ 208
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| Senior Notes | 7.50% Senior Notes due 2022 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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7.50%
|
7.50%
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| Debt Instrument, Repurchased Face Amount |
|
$ 125
|
$ 125
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| Early Repayment of Senior Debt |
|
135
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|
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| Interest Paid |
|
1
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| Gain (Loss) on Extinguishment of Debt |
|
(10)
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| Outstanding Aggregate Principal Amount |
|
$ 350
|
$ 350
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| Senior Notes | 7.00% Senior Notes due 2024 |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Interest Rate, Stated Percentage |
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7.00%
|
7.00%
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| Debt Instrument, Repurchased Face Amount |
|
$ 25
|
$ 25
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| Early Repayment of Senior Debt |
|
26
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| Interest Paid |
|
1
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| Gain (Loss) on Extinguishment of Debt |
|
(1)
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| Outstanding Aggregate Principal Amount |
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$ 475
|
$ 475
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