Income Tax (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	$ 129	$ 163	$ 272
Additions for tax positions of prior years	27	42	19
Reductions for tax positions of prior years (1)	(30)	(93)	(112)
Additions for tax positions of current year	5	22	5
Reductions for tax positions of current year	0	(3)	(18)
Settlements with tax authorities	0	(2)	(3)
Balance at December 31,	131	129	163
Unrecognized tax benefits that, if recognized, would impact the effective rate	$ 90	$ 80	$ 103