Income Taxes, Change in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrecognized Tax Benefits [Roll Forward]
Balance as of beginning of year	$ 816	$ 847	$ 897
Additions for tax positions related to the current year	27	3	5
Additions for tax positions related to prior years	19	13	9
Reductions for tax positions related to prior years	(573)	(25)	(20)
Reductions for tax positions related to the lapse of applicable statute of limitations	(5)	0	(44)
Settlements	0	(22)	0
Balance as of end of year	$ 284	$ 816	$ 847