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Pension and Other Post-Employment Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 11, 2021
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Pension and OPEB prior service costs amortized out of AOCI   $ 1 $ 1   $ 2 $ 6
Mark-to-market adjustment       $ 423    
Pension            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Service costs   48 48   97 100
Interest costs   57 70   113 145
Expected return on plan assets   (163) (155)   (326) (308)
Amortization of prior service costs (credits)   1 1   2 11
One-time termination benefit         0 8
Pension and OPEB mark-to-market adjustment         0 386
Net periodic credits, including amounts capitalized   (57) (36)   (114) 342
Net periodic credits, recognized in earnings   (85) (62)   (163) 296
Net accelerated credits       $ 18    
Estimated return 7.50%          
OPEB            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Service costs   1 1   2 2
Interest costs   2 4   5 8
Expected return on plan assets   (7) (8)   (17) (16)
Amortization of prior service costs (credits)   (5) (5)   (9) (38)
One-time termination benefit         0 0
Pension and OPEB mark-to-market adjustment         0 37
Net periodic credits, including amounts capitalized   (9) (8)   (19) (7)
Net periodic credits, recognized in earnings   $ (10) $ (8)   $ (20) $ (7)