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Debt - Summary (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 22, 2016 | Aug. 18, 2015 | May 26, 2015
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Total debt | $ 3,569 | $ 3,564 |  |  |
Less: short-term debt including current maturities | 399 | 0 |  |  |
Long-term debt | 3,170 | 3,564 |  |  |
Senior Notes | 2.5% Senior Notes, due 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 399 | 398 |  |  |
Interest rate (as a percent) | 2.50% |  |  | 2.50% |
Unamortized debt discount and issuance costs | $ 1 |  |  |  |
Senior Notes | 3.3% Senior Notes, due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 697 | 696 |  |  |
Interest rate (as a percent) | 3.30% |  |  | 3.30% |
Unamortized debt discount and issuance costs | $ 3 |  |  |  |
Senior Notes | 4.0% Senior Notes, due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 692 | 691 |  |  |
Interest rate (as a percent) | 4.00% |  |  |  | 4.00%
Unamortized debt discount and issuance costs | $ 8 |  |  |  |
Senior Notes | 4.4% Senior Notes, due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 892 | 891 |  |  |
Interest rate (as a percent) | 4.40% |  |  | 4.40% |
Unamortized debt discount and issuance costs | $ 8 |  |  |  |
Senior Notes | 2.95% Senior Notes, due 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 493 | 492 |  |  |
Interest rate (as a percent) | 2.95% |  | 2.95% |  |
Unamortized debt discount and issuance costs | $ 7 |  |  |  |
Senior Notes | 6.55% Senior Notes, due 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes | $ 396 | $ 396 |  |  |
Interest rate (as a percent) | 6.55% |  |  |  |
Unamortized debt discount and issuance costs | $ 4 |  |  |  |

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