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Income Taxes - Unrecognized tax benefit (expense) (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, beginning of period $ 16 $ 15 $ 14
Gross increases - tax positions in current period 6 6 1
Lapse of statute of limitations 0 5 0
Balance, end of period $ 22 $ 16 $ 15