Benefit Plans (Pension and Other Employee Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Total pension and other employee benefit costs	$ 115	$ 97	$ 89
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total pension and other employee benefit costs	(1)	(14)	(18)
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension and other employee benefit costs	108	103	100
Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
Total pension and other employee benefit costs	$ 8	$ 8	$ 7