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Debt - Extinguishment (Details) (Uncollateralized Debt [Member], USD $)
In Millions, unless otherwise specified |
0 Months Ended |
|---|---|
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Apr. 13, 2015
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| Notes due 2016 2.75% Interest [Member] | |
| Extinguishment of Debt [Line Items] | |
| Extinguishment of Debt, Amount | $ 626 |
| Extinguishment of Debt, Gain (Loss), Net of Tax | (14) |
| Basis Points Added To Treasury Rate | 0.30% |
| Notes due 2019 8.5% Interest [Member] | |
| Extinguishment of Debt [Line Items] | |
| Extinguishment of Debt, Amount | 329 |
| Extinguishment of Debt, Gain (Loss), Net of Tax | $ (51) |
| Basis Points Added To Treasury Rate | 0.50% |