Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 3
Interest cost	2	1
Expected return on plan assets	(2)	(2)
Amortization of prior service cost	0	0
Amortization of prior actuarial loss	1	1
Total	4	3
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1
Interest cost	1	0
Expected return on plan assets	0	0
Amortization of prior service cost	0	0
Amortization of prior actuarial loss	0	1
Total	$ 1	$ 2