Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 1,375	$ 1,474
Increase in tax positions of the current year netted against deferred tax assets	0	1
Increase in tax positions of prior periods netted against deferred tax assets	0	0
Decrease in tax positions of the current year netted against deferred tax assets	0	(101)
Decrease in tax positions of prior periods netted against deferred tax assets	(661)	(1)
Increase in tax positions taken in the current year	634	4
(Decrease) increase in tax positions taken in the prior year	(3)
(Decrease) increase in tax positions taken in the prior year		2
Decrease due to payments/settlements	0	(3)
Decrease from the lapse of statute of limitations	0	(1)
Decrease related to divestitures of businesses	(27)	0
Unrecognized tax benefits at end of year	$ 1,318	$ 1,375