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Pensions and Other Benefits - Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 11 $ 14
Interest cost 39 40
Expected return on plan assets (89) (89)
Amortization of prior service credit 0 0
Amortization of actuarial net loss (gain) 18 38
Net periodic benefit cost (income), excluding below (21) 3
Multiemployer plans 19 19
Settlement, termination and curtailment losses (a) 1 0
Net periodic benefit cost (income) (1) 22
Pension Benefits | Employee Related Costs    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Settlement, termination and curtailment losses (a) (1)  
Other Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 2 3
Interest cost 12 12
Expected return on plan assets (22) (20)
Amortization of prior service credit (7) (7)
Amortization of actuarial net loss (gain) (13) (6)
Net periodic benefit cost (income), excluding below (28) (18)
Multiemployer plans 0 0
Settlement, termination and curtailment losses (a) 0 0
Net periodic benefit cost (income) $ (28) $ (18)