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Related Party Transactions (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Operating expenses |  | $ 503 |  |  | $ 3,018 | $ 1,544 | $ 3,858 |
Prepaid expenses and other current assets |  | 118 |  |  |  | 118 |  | $ 129
Accounts payable |  | 69 |  |  |  | $ 69 |  | 72
Stock repurchased and retired during period, value |  | $ 362 | $ 325 | $ 715 |  |  |  |
Stock Repurchase Program - June 2024 |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Repurchase and retirement of common stock (in shares) |  | 10,782,385 |  |  |  | 13,069,383 |  |
Stock repurchased and retired during period, value |  | $ 362 |  |  |  | $ 437 |  |
Related Party |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 0 | 0 |  |  |
Operating expenses |  |  |  | $ 8 | $ 7 |  | $ 18 |
Prepaid expenses and other current assets |  |  |  |  |  |  |  | 13
Accounts payable |  |  |  |  |  |  |  | $ 0
Related Party | Stock Repurchase Program - June 2024 |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Repurchase and retirement of common stock (in shares) | 3,700,000 |  |  |  |  |  |  |
Stock repurchased and retired during period, value | $ 117 |  |  |  |  |  |  |

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