Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,424	$ 1,318
Decrease in tax positions of prior periods netted against deferred tax assets	(4)	(411)
Decrease in tax positions taken in the current year	(64)	(73)
Increase in tax positions taken in the prior year	65	752
Decrease due to payments/settlements	0	(1)
Decrease from the lapse of statute of limitations	(158)	(52)
Decrease related to divestitures of businesses	0	(109)
Unrecognized tax benefits at end of year	$ 1,263	$ 1,424