Employee Benefit Plans (Schedule of Net Funded Status) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 133	$ 103
Defined Benefit Plan, Benefit Obligation		220	179
Defined Benefit Plan, Funded Status of Plan, Total		(87)	(76)
Qualified Plan [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount		133	103
Defined Benefit Plan, Benefit Obligation		139	112
Defined Benefit Plan, Funded Status of Plan, Total		(6)	(9)
Nonqualified Plan [Member]
Defined Benefit Plan Change In Benefit Obligation [Line Items]
Defined Benefit Plan, Plan Assets, Amount	[1]	0	0
Defined Benefit Plan, Benefit Obligation	[1]	81	67
Defined Benefit Plan, Funded Status of Plan, Total	[1]	$ (81)	$ (67)

[1] For non-qualified plans, there are no required funding levels.