Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Income Tax Uncertainties [Abstract] | |||
| Balance at beginning of year | $ 83 | $ 75 | $ 70 |
| Additions based on tax positions related to the current year | 9 | 7 | 5 |
| Additions for tax positions of prior years | 1 | 7 | 14 |
| Reductions for tax positions of prior years | (1) | (1) | (3) |
| Lapse of statute and settlements | (4) | (5) | (11) |
| Balance at end of year | 88 | 83 | 75 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 70 | 66 | 61 |
| Reasonably possible change in unrecognized tax benefit within 12 months | 2 | ||
| Accrued interest and penalties related to uncertain tax positions | $ 28 | $ 25 | $ 23 |