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Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of the change in the amount of unrecognized tax benefits      
Balance – beginning of year $ 17 $ 12 $ 70
Acquisitions 0 5 0
Decrease for settlements 0 0 (58)
Balance – end of year $ 17 $ 17 $ 12