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Employee Benefits (Composition of Employee Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]    
Fair value of plan assets $ 583 $ 518
Termination benefits (105) (111)
Defined benefit obligation (1,004) (860)
Total Employee benefits $ (526) $ (453)