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Schedule of Long-term Debt Outstanding (Details) - Senior Notes - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2014 | Dec. 31, 2008
Debt Instrument [Line Items] |  |  |  |
Total long-term debt | $ 3,793,000,000 | $ 3,794,000,000 |  |
Redemption price, percentage | 100.00% |  |  |
Unamortized discount (premium) | $ 27,000,000 | $ 28,000,000 |  | $ 103,000,000
6.45% Senior Notes due June 2016 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount (premium) |  |  | $ 12,000,000 |
$500 million, 7.20% due June 15, 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.20% | 7.20% |  |
Face amount | $ 500,000,000 | $ 500,000,000 |  |
Total long-term debt | $ 501,000,000 | $ 502,000,000 |  |
$300 million, 6.30% due August 1, 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.30% | 6.30% |  |
Face amount | $ 300,000,000 | $ 300,000,000 |  |
Total long-term debt | $ 307,000,000 | $ 307,000,000 |  |
$400 million, 2.625% due October 1, 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.625% | 2.625% |  |
Face amount | $ 400,000,000 | $ 400,000,000 |  |
Total long-term debt | $ 398,000,000 | $ 398,000,000 |  |
$600 million, 3.15% due December 1, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.15% | 3.15% |  |
Face amount | $ 600,000,000 | $ 600,000,000 |  |
Total long-term debt | $ 595,000,000 | $ 595,000,000 |  |
$600 million, 3.85% due October 1, 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 3.85% | 3.85% |  |
Face amount | $ 600,000,000 | $ 600,000,000 |  |
Total long-term debt | $ 595,000,000 | $ 595,000,000 |  |
$250 million, 8.15% due June 15, 2038 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 8.15% | 8.15% |  |
Face amount | $ 250,000,000 | $ 250,000,000 |  |
Total long-term debt | $ 263,000,000 | $ 263,000,000 |  |
$400 million, 4.625% due December 1, 2042 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.625% | 4.625% |  |
Face amount | $ 400,000,000 | $ 400,000,000 |  |
Total long-term debt | $ 396,000,000 | $ 396,000,000 |  |
$750 million, 4.95% due October 1, 2044 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.95% | 4.95% |  |
Face amount | $ 750,000,000 | $ 750,000,000 |  |
Total long-term debt | $ 738,000,000 | $ 738,000,000 |  |

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