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Debt - Summary (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2019 | Dec. 31, 2019 | Nov. 26, 2019 | Dec. 31, 2018 | May 17, 2018 | Sep. 22, 2016 | Aug. 18, 2015 | May 26, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  | $ 3,948 |  | $ 3,662 |  |  |  |
Senior Notes | 3.3% Senior Notes, due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 0 |  | 698 |  |  |  |
Interest rate (as a percent) |  | 3.30% |  |  |  |  | 3.30% |
Early repayment of debt |  | $ 700 |  |  |  |  |  |
Senior Notes | 4.0% Senior Notes, due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 694 |  | 693 |  |  |  |
Interest rate (as a percent) |  | 4.00% |  |  |  |  |  | 4.00%
Unamortized debt discount and issuance costs |  | $ 6 |  |  |  |  |  |
Senior Notes | 4.4% Senior Notes, due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 893 |  | 892 |  |  |  |
Interest rate (as a percent) |  | 4.40% |  |  |  |  | 4.40% |
Unamortized debt discount and issuance costs |  | $ 7 |  |  |  |  |  |
Senior Notes | 2.95% Senior Notes, due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 493 |  | 493 |  |  |  |
Interest rate (as a percent) |  | 2.95% |  |  |  | 2.95% |  |
Unamortized debt discount and issuance costs |  | $ 7 |  |  |  |  |  |
Senior Notes | 2.5% Senior Notes, due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 495 |  | 0 |  |  |  |
Interest rate (as a percent) |  | 2.50% | 2.50% |  |  |  |  |
Unamortized debt discount and issuance costs |  | $ 5 |  |  |  |  |  |
Senior Notes | 6.55% Senior Notes, due 2037 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 294 |  | 396 |  |  |  |
Interest rate (as a percent) |  | 6.55% |  |  |  |  |  |
Early repayment of debt | $ 103 |  |  |  |  |  |  |
Unamortized debt discount and issuance costs |  | $ 3 |  |  |  |  |  |
Senior Notes | 4.5% Senior Notes, due 2048 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 490 |  | 490 |  |  |  |
Interest rate (as a percent) |  | 4.50% |  |  | 4.50% |  |  |
Unamortized debt discount and issuance costs |  | $ 10 |  |  |  |  |  |
Senior Notes | 3.25% Senior Notes, due 2049 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes |  | $ 589 |  | $ 0 |  |  |  |
Interest rate (as a percent) |  | 3.25% | 3.25% |  |  |  |  |
Unamortized debt discount and issuance costs |  | $ 11 |  |  |  |  |  |

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