Income Taxes - Reconciliation of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Income Tax Disclosure [Abstract] | |||
| Unrecognized tax benefits, beginning balance | $ 912 | $ 1,022 | $ 940 |
| Additions for tax positions of prior years | 25 | 13 | 18 |
| Reductions for tax positions of prior years | (22) | (75) | (4) |
| Additions based on tax positions related to current year | 49 | 55 | 69 |
| Additions related to business combinations | 16 | 0 | 0 |
| Settlements | (231) | (103) | (1) |
| Unrecognized tax benefits, ending balance | $ 749 | $ 912 | $ 1,022 |