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Employee Postretirement Benefits (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Pension Plans      
Service cost $ 16 $ 21 $ 22
Interest cost 89 80 95
Expected return on plan assets [1] (123) (132) (134)
Recognized net actuarial loss 34 37 42
Other 1 (5) (4)
Net periodic benefit cost 69 90 70
Defined Benefit Pension Plans | Nonoperating (income) expense      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (52) (89) (49)
Other Postretirement Benefit Plans      
Service cost 7 8 8
Interest cost 21 19 23
Expected return on plan assets [1] 0 0 0
Recognized net actuarial loss 1 1 1
Other (1) (2) (2)
Net periodic benefit cost 28 26 30
Other Pension Plan | Nonoperating (income) expense      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment $ 0 $ 0 $ 0
[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.