Income Taxes (Reconciliation of Changes to the Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred Tax Asset, Valuation Allowance [Roll Forward]
Valuation allowance, beginning balance	$ 1,539	$ 87
Establishment of valuation allowance on opening deferred balance	0	408
Return to accrual adjustments	(31)	6
Current period deferred activity	(1)	626
Reduction due to 382 limitations on NOLs	(428)	(120)
Purchase accounting	0	532
Valuation allowance, ending balance	$ 1,079	$ 1,539