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Debt - Letters of Credit, Borrowings and Repayments (Details) - USD ($) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 03, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Debt |  |  |  |  |
Outstanding letters of credit |  | $ 140 |  |  | $ 157
Senior notes |  |  |  |  |
Debt |  |  |  |  |
Debt instrument face value |  | $ 9,700 |  |  | $ 9,000
Senior Notes Due In September 2030 At 3.80 Percent | Senior notes |  |  |  |  |
Debt |  |  |  |  |
Debt instrument face value |  |  |  | $ 750 |
Stated percentage |  |  |  | 3.80% |
Public offering price |  |  |  | 99.794% |
5.00% senior notes due February 2021 | Senior notes |  |  |  |  |
Debt |  |  |  |  |
Stated percentage |  | 5.00% |  |  |
5.00% senior notes due February 2021 | Subsequent Event | Senior notes |  |  |  |  |
Debt |  |  |  |  |
Stated percentage | 5.00% |  |  |  |
Senior notes redeemed amount | $ 600 |  |  |  |
Credit facilities and commercial paper program |  |  |  |  |
Debt |  |  |  |  |
Total borrowings |  | $ 20,200 | $ 10,500 |  |
Total repayments |  | $ 20,500 | $ 10,500 |  |

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