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Employee Benefits (Composition of Employee Benefits) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Classes of employee benefits expense [abstract]    
Fair value of plan assets $ 648 $ 629
Termination benefits (135) (158)
Defined benefit obligation (993) (1,075)
Total Employee benefits $ (480) $ (604)