Employee Benefit Plans (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	$ 220
Defined Benefit Plan, Benefit Obligation, Ending Balance	254	$ 220
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	220	179
Defined Benefit Plan, Service Cost	14	13	$ 13
Defined Benefit Plan, Interest Cost	6	7	5
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	25	28
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(12)	(8)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	1	1
Defined Benefit Plan, Benefit Obligation, Ending Balance	254	220	179
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Benefit Obligation, Beginning Balance	87	67
Defined Benefit Plan, Service Cost	3	3	3
Defined Benefit Plan, Interest Cost	2	3	2
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)	0	0
Defined Benefit Plan, Actuarial Net (Gains) Losses	(9)	15
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)	(2)	(1)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	0	0
Defined Benefit Plan, Benefit Obligation, Ending Balance	$ 81	$ 87	$ 67