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Employee Postretirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Pension Plans      
Service cost $ 21 $ 22 $ 21
Interest cost 80 95 121
Expected return on plan assets [1] (132) (134) (144)
Recognized net actuarial loss 37 42 44
Settlements and curtailments 89 49 45
Other (5) (4) (4)
Net periodic benefit cost 90 70 83
Other Postretirement Benefit Plans      
Service cost 8 8 8
Interest cost 19 23 28
Expected return on plan assets [1] 0 0 0
Recognized net actuarial loss 1 1 0
Settlements and curtailments 0 0 0
Other (2) (2) (1)
Net periodic benefit cost $ 26 $ 30 $ 35
[1] The expected return on plan assets is determined by multiplying the fair value of plan assets at the remeasurement date, typically the prior year-end adjusted for estimated current year cash benefit payments and contributions, by the expected long-term rate of return.