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Income Taxes Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Changes in Unrecognized Tax Benefits [Abstract]      
Balance at beginning of year $ 52 $ 56 $ 90
Reduction attributable to tax positions taken in prior years (9) (4) (34)
Tax Adjustments, Settlements, and Unusual Provisions (3) 0 0
Balance at end of year $ 40 $ 52 $ 56