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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Beginning balance $ 572 $ 1,124 $ 1,091
Additions due to acquisitions 0 15 26
Additions for tax positions of current year 4 104 32
Additions for tax positions of prior years 34 24 60
Reductions for tax positions of prior years (43) (659) (5)
Closure of tax years (6) (4) (27)
Settlements (21) (32) (53)
Ending balance $ 540 $ 572 $ 1,124