Income Tax (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	$ 272	$ 256	$ 1,111
Additions for tax positions of prior years	19	16	6
Reductions for tax positions of prior years (1)	(112)	(1)	(493)
Additions for tax positions of current year	5	12	13
Reductions for tax positions of current year	(18)	0	0
Settlements with tax authorities (2)	(3)	(1)	(381)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0	(10)	0
Balance at December 31,	163	272	256
Unrecognized tax benefits that, if recognized, would impact the effective rate	$ 103	$ 203	194
Current Income Tax Payable
Reconciliation of Unrecognized Tax Benefits
Settlements with tax authorities (2)			$ (377)