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Debt - Senior Notes, Borrowings and Repayments and Letters of Credit (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Debt |  |  |
Outstanding letters of credit | $ 143 |  | $ 205
Senior Notes |  |  |
Debt |  |  |
Debt instrument face value | 7,900 |  | $ 7,300
5.70% senior notes due September 2034 | Senior Notes |  |  |
Debt |  |  |
Debt instrument face value | $ 650 |  |
Debt instrument, interest rate (as a percent) | 5.70% |  |
Public offering price (as a percent) | 99.953% |  |
Commercial Paper Program |  |  |
Debt |  |  |
Total borrowings | $ 20,600 | $ 1,500 |
Total repayments | $ 21,000 | $ 1,500 |

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