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Debt - Narrative (Details) |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 20, 2016 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Sep. 22, 2016 USD ($) | Aug. 31, 2015 USD ($) | Aug. 18, 2015 USD ($) | May 26, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Annual long term debt maturity year 2018 |  | $ 0 |  |  |  |  |
Annual long term debt maturity year 2019 |  | 0 |  |  |  |  |
Annual long term debt maturity year 2020 |  | 697,000,000 |  |  |  |  |
Annual long term debt maturity 2021 |  | 0 |  |  |  |  |
Annual long term debt maturity thereafter |  | $ 2,500,000,000 |  |  |  |  |
Indebtedness to cash flow (not greater than) |  | 4 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 2,000,000,000.0 | $ 2,000,000,000.0 |
2.95% Senior Notes, due 2027 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 500,000,000 |  |  |
Interest rate (as a percent) |  | 2.95% |  | 2.95% |  |  |
5.9% Senior Notes, due 2017 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate (as a percent) | 5.90% |  |  |  |  |  |
Early repayment of debt | $ 400,000,000 |  |  |  |  |  |
2.5% Senior Notes, due 2018 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 400,000,000 |
Interest rate (as a percent) |  | 2.50% |  |  |  | 2.50% |
3.3% Senior Notes, due 2020 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 700,000,000 |
Interest rate (as a percent) |  | 3.30% |  |  |  | 3.30% |
4.4% Senior Notes, due 2026 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 900,000,000 |
Interest rate (as a percent) |  | 4.40% |  |  |  | 4.40% |
4.0% Senior Notes, due 2025 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 700,000,000
Interest rate (as a percent) |  | 4.00% |  |  |  |  | 4.00%
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 1,200,000,000 |  |  |  |
Commitment fee |  | 0.125% |  |  |  |  |
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  | $ 1,200,000,000 |  |  |  |
Minimum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee |  | 0.08% |  |  |  |  |
Maximum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee |  | 0.175% |  |  |  |  |

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