Income Taxes (Reconciliation of Changes to the Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Asset, Valuation Allowance [Roll Forward]
Valuation allowance, beginning balance	$ 589	$ 1,079
Return to accrual adjustments	(12)	(36)
State rate and apportionment changes	(13)	(66)
Current period deferred activity	0	(388)
Release of valuation allowance	(512)	0
Valuation allowance, ending balance	$ 52	$ 589