Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	$ 3	$ 11	$ 9
Interest cost	1	2	4	5
Expected return on plan assets	(2)	(2)	(7)	(5)
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	1	1	3	3
Total	4	4	11	12
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	0	2	2
Interest cost	0	1	2	2
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	(1)	(1)
Amortization of prior actuarial loss	0	0	1	1
Total	$ 1	$ 1	$ 4	$ 4