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Employee Benefits - Net Pension Cost and Amount Recognized in OCI for All Funded and Unfunded Plans (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Interest cost $ 45 $ 27 $ 25
Expected return on plan assets (42) (27) (28)
Amortization of losses 9 15 18
Settlement loss 18 12 9
Net postretirement benefit cost 30 27 24
Other changes in plan assets and benefit obligations recognized in OCI:      
Net (gain) loss 26 31 (19)
Amortization of gains (27) (27) (27)
Total recognized in comprehensive income (1) 4 (46)
Total recognized in net pension cost and comprehensive income $ 29 $ 31 $ (22)