Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 3	$ 7	$ 6
Interest cost	1	2	3	3
Expected return on plan assets	(3)	(1)	(5)	(3)
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	1	1	2	2
Total	3	5	7	8
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	1	2
Interest cost	1	1	2	1
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	(1)	(1)	(1)	(1)
Amortization of prior actuarial loss	1	0	1	1
Total	$ 2	$ 1	$ 3	$ 3