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Employee Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax      
Total recognized $ 44 $ (23) $ 23
Non-Cash settlement charge of unamortized actuarial loss, before tax 13 3 3
Retirement Plans      
Components of net periodic cost for retirement plans and post-retirement plans      
Service cost 3 4 4
Interest cost 48 40 52
Expected return on assets (87) (104) (102)
Actuarial loss (gain) 15 21 17
Prior service credit 0 0 0
Net periodic benefit cost (21) (39) (29)
Settlement charge 13 3 3
Total net periodic benefit cost (8) (36) (26)
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax      
Net actuarial loss (gain) 67 (6) 28
Recognized actuarial (gain) loss (12) (15) (9)
Prior service cost 0 0 0
Settlement charge (10) (2) (2)
Total recognized 45 (23) 17
Postretirement Plans      
Components of net periodic cost for retirement plans and post-retirement plans      
Service cost 0 0 0
Interest cost 1 1 1
Expected return on assets 0 0 0
Actuarial loss (gain) (2) (2) (2)
Prior service credit (2) (1) (1)
Net periodic benefit cost (3) (2) (2)
Settlement charge 0 0 0
Total net periodic benefit cost (3) (2) (2)
Other changes in plan assets and benefit obligations recognized in other comprehensive income, net of tax      
Net actuarial loss (gain) (3) (1) 1
Recognized actuarial (gain) loss 1 1 2
Prior service cost 1 (1) 1
Settlement charge 0 0 0
Total recognized $ (1) $ (1) $ 4