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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at January 1, $ 1,343 $ 1,230 $ 1,210
(Decrease) / Increase due to prior year positions   8 21
(Decrease) due to prior year tax positions (26)    
Increase due to current year positions 107 137 31
Reduction related to settlements with taxing authorities (13) (4) (15)
Reduction related to lapse of applicable statute of limitations (12) (28) (17)
Balance at December 31, 1,399 1,343 1,230
Liability for net interest expense on uncertain tax positions $ 220 $ 176 $ 148