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Debt - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Nov. 26, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | May 17, 2018 | Jun. 30, 2017 | Aug. 18, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |
Annual long term debt maturity year 2020 | $ 0 |  |  |  |  |  |
Annual long term debt maturity year 2021 | 0 |  |  |  |  |  |
Annual long term debt maturity year 2022 | 0 |  |  |  |  |  |
Annual long term debt maturity year 2023 | 0 |  |  |  |  |  |
Annual long term debt maturity year 2024 | 0 |  |  |  |  |  |
Annual long term debt maturity thereafter | 3,900,000,000 |  |  |  |  |  |
Commercial paper borrowings outstanding | $ 0 |  | $ 0 |  |  |  |
Indebtedness to cash flow (not greater than) | 4 |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 2,000,000,000.0
2.5% Senior Notes, due 2029 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 500,000,000 |  |  |  |  |
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 |  |  |  |  |  | $ 700,000,000
Interest rate (as a percent) | 3.30% |  |  |  |  |  | 3.30%
3.25% Senior Notes, due 2049 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 600,000,000 |  |  |  |  |
Interest rate (as a percent) | 3.25% | 3.25% |  |  |  |  |
6.55% Senior Notes, due 2037 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount | $ 400,000,000 |  |  |  |  |  |
Interest rate (as a percent) | 6.55% |  |  |  |  |  |
4.5% Senior Notes, due 2048 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 500,000,000 |  |
Interest rate (as a percent) | 4.50% |  |  |  | 4.50% |  |
2.5% Senior Notes, due 2018 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 400,000,000 |  |  | $ 400,000,000
Interest rate (as a percent) |  |  |  | 2.50% |  |  | 2.50%
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  | $ 1,200,000,000 |
Term of debt instrument |  |  |  | 5 years |  |  |
Commitment fee ratio | 0.10% |  |  |  |  |  |
Minimum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee ratio | 0.08% |  |  |  |  |  |
Maximum | Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment fee ratio | 0.175% |  |  |  |  |  |

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