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Employee Benefit Plans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1 $ 2
Interest cost 6 6
Expected return on plan assets (9) (10)
Net amortization (1) (2)
Net periodic benefit cost (3) (4)
UNITED STATES | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 3 4
Interest cost 23 27
Expected return on plan assets (35) (38)
Net amortization 9 9
Net periodic benefit cost 0 2
UNITED KINGDOM | Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 4 4
Interest cost 10 13
Expected return on plan assets (25) (25)
Net amortization 10 9
Net periodic benefit cost $ (1) $ 1