Income Taxes (Summary of Activities Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | |||
Beginning balance | $ 26 | $ 29 | $ 28 |
Increases related to tax positions taken during a prior period | 2 | 0 | 1 |
Increases related to tax positions taken during the current period | 2 | 2 | 4 |
Decreases related to settlements with taxing authorities | 0 | 0 | (1) |
Decreases related to tax positions taken during a prior period | 0 | (2) | (1) |
Decreases as a result of a lapse of the applicable statute of limitations | (3) | (3) | (2) |
Ending balance | $ 27 | $ 26 | $ 29 |