Income Taxes (Reconciliation of Beginning and Ending Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 1,608	$ 69	$ 53
Additions based on tax positions related to the current year	0	1,548	1
Additions for tax positions of prior years	33	0	16
Reductions for tax positions related to IRS Agreement	(1,343)	0	0
Reductions for tax positions of prior years	(16)	(6)	0
Tax settlements	0	(3)	(1)
Balance at end of year	$ 282	$ 1,608	$ 69