DEBT - Schedule of Long-term Debt Outstanding (Details) - Senior Notes - USD ($)
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9 Months Ended |
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Sep. 30, 2016 |
Dec. 31, 2015 |
Oct. 31, 2014 |
Dec. 31, 2008 |
| Debt Instrument [Line Items] |
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| Total long-term debt |
$ 3,792,000,000
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$ 3,794,000,000
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| Redemption price, percentage |
100.00%
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| Unamortized discount (premium) |
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$ 103,000,000
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| $500 million, 7.20% due June 15, 2018 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
7.20%
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7.20%
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| Face amount |
$ 500,000,000
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$ 500,000,000
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| Total long-term debt |
$ 501,000,000
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$ 502,000,000
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| $300 million, 6.30% due August 1, 2018 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
6.30%
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6.30%
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| Face amount |
$ 300,000,000
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$ 300,000,000
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| Total long-term debt |
$ 305,000,000
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$ 307,000,000
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| $400 million, 2.625% due October 1, 2019 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
2.625%
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2.625%
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| Face amount |
$ 400,000,000
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$ 400,000,000
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| Total long-term debt |
$ 398,000,000
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$ 398,000,000
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| $600 million, 3.15% due December 1, 2022 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
3.15%
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3.15%
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| Face amount |
$ 600,000,000
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$ 600,000,000
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| Total long-term debt |
$ 595,000,000
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$ 595,000,000
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| $600 million, 3.85% due October 1, 2024 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
3.85%
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3.85%
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| Face amount |
$ 600,000,000
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$ 600,000,000
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| Total long-term debt |
$ 595,000,000
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$ 595,000,000
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| $250 million, 8.15% due June 15, 2038 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
8.15%
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8.15%
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| Face amount |
$ 250,000,000
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$ 250,000,000
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| Total long-term debt |
$ 263,000,000
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$ 263,000,000
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| $400 million, 4.625% due December 1, 2042 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
4.625%
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4.625%
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| Face amount |
$ 400,000,000
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$ 400,000,000
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| Total long-term debt |
$ 396,000,000
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$ 396,000,000
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| $750 million, 4.95% due October 1, 2044 |
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| Debt Instrument [Line Items] |
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| Stated interest rate |
4.95%
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4.95%
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| Face amount |
$ 750,000,000
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$ 750,000,000
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| Total long-term debt |
739,000,000
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738,000,000
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| 6.45% Senior Notes due June 2016 |
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| Debt Instrument [Line Items] |
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| Unamortized discount (premium) |
$ 24,000,000
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$ 28,000,000
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$ 12,000,000
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