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v3.7.0.1

DEBT - Senior Notes (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Oct. 31, 2014 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2008
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 701,000,000 | $ 300,000,000 |
Total debt |  |  | 4,980,000,000 | 4,092,000,000 |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | $ 4,279,000,000 | 3,792,000,000 |
Proceeds from debt, net of discounts and offering expenses | $ 991,000,000 |  |  |  |
Redemption price, percentage |  |  | 100.00% |  |
Unamortized discount (premium) |  |  |  |  | $ 103,000,000
Senior Notes | $500 million, 7.20% due June 15, 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 7.20% |  |
Face amount |  |  | $ 500,000,000 |  |
Long-term debt |  |  | $ 0 | 501,000,000 |
Senior Notes | $300 million, 6.30% due August 1, 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 6.30% |  |
Face amount |  |  | $ 300,000,000 |  |
Long-term debt |  |  | $ 303,000,000 | 304,000,000 |
Senior Notes | $400 million, 2.625% due October 1, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 2.625% |  |
Face amount |  |  | $ 400,000,000 |  |
Long-term debt |  |  | $ 398,000,000 | 398,000,000 |
Senior Notes | $600 million, 3.15% due December 1, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 3.15% |  |
Face amount |  |  | $ 600,000,000 |  |
Long-term debt |  |  | $ 596,000,000 | 595,000,000 |
Senior Notes | $600 million, 3.85% due October 1, 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 3.85% |  |
Long-term debt |  |  | $ 595,000,000 | 595,000,000 |
Senior Notes | $600 million, 3.95% due March 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 3.95% |  |  |  |
Face amount | $ 600,000,000 |  | 600,000,000 |  |
Long-term debt |  |  | $ 594,000,000 | 0 |
Senior Notes | $250 million, 8.15% due June 15, 2038 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 8.15% |  |
Face amount |  |  | $ 250,000,000 |  |
Long-term debt |  |  | $ 263,000,000 | 264,000,000 |
Senior Notes | $400 million, 4.625% due December 1, 2042 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 4.625% |  |
Face amount |  |  | $ 400,000,000 |  |
Long-term debt |  |  | $ 396,000,000 | 396,000,000 |
Senior Notes | $750 million, 4.95% due October 1, 2044 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 4.95% |  |
Face amount |  |  | $ 750,000,000 |  |
Long-term debt |  |  | 739,000,000 | 739,000,000 |
Senior Notes | $400 million, 4.80% due March 15, 2047 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.80% |  |  |  |
Face amount | $ 400,000,000 |  |  |  |
Long-term debt |  |  | 395,000,000 | 0 |
Senior Notes | 6.45% Senior Notes due June 2016 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 6.45% |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 12,000,000 |  |  |
Unamortized discount (premium) |  |  | 21,000,000 | 23,000,000 |
Commercial paper |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  |  | 200,000,000 | 300,000,000 |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 501,000,000 | $ 0 |

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