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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]        
Increase (decrease) in deferred tax $ (1,700) $ (1,200)    
Unrecognized Tax Benefits [Roll Forward]        
Unrecognized tax benefits at beginning of year   3,345 $ 3,513 $ 2,657
Gross increases - current year tax positions   201 177 814
Gross increases - prior year tax positions   1,437 42 93
Gross decreases - prior year tax positions   (37) (315) (51)
Gross decreases - settlements with tax authorities   (6) 0 0
Gross decreases - lapse of statute of limitations   (3) (72) 0
Unrecognized tax benefits at end of year $ 3,513 $ 4,937 $ 3,345 $ 3,513