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Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 4 $ 13 $ 11
Interest cost 1 1 3 4
Expected return on plan assets (3) (2) (8) (7)
Amortization of prior service cost 0 0 0 0
Amortization of prior actuarial loss 2 1 5 3
Total 4 4 13 11
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 2 2
Interest cost 0 0 1 2
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 (1) (1)
Amortization of prior actuarial loss 1 0 2 1
Total $ 1 $ 1 $ 4 $ 4