Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
| Balance at beginning of year | $ 597 | $ 508 | $ 337 |
| Gross increases related to prior year tax positions | 7 | 14 | 2 |
| Gross decreases related to prior year tax positions | (2) | (2) | (6) |
| Gross increases related to current year tax positions | 60 | 85 | 196 |
| Reductions due to settlements with taxing authorities | (7) | (1) | (21) |
| Reduction due to lapse in statute of limitations | (5) | (7) | 0 |
| Balance at end of year | $ 650 | $ 597 | $ 508 |