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Share-based Compensation and Employee Benefits - Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Components of net benefit cost (credit):      
Service cost $ 59 $ 53 $ 52
Interest cost 71 96 84
Expected return on assets (137) (129) (149)
Amortization of prior service cost (credit) 1 0 0
Amortization of net actuarial loss (gain) 40 54 40
Net benefit cost (credit) 34 74 27
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:      
Net loss (gain) arising during period 157 (42) 105
Amortization or settlement recognition of net actuarial (loss) gain (40) (54) (87)
Amortization of prior service (cost) credit (1) 0 (1)
Total recognized in total other comprehensive loss (income)(a) 116 (96) 17
Total recognized in net benefit cost (credit) and other comprehensive loss (income) 150 (22) 44
Pension Benefits | Retirement Plan Name, Other      
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:      
Total recognized in total other comprehensive loss (income)(a) 2    
OPEB      
Components of net benefit cost (credit):      
Service cost 1 1 1
Interest cost 8 12 12
Expected return on assets (16) (16) (20)
Amortization of prior service cost (credit) (5) (4) (4)
Amortization of net actuarial loss (gain) (13) (11) (6)
Net benefit cost (credit) (25) (18) (17)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:      
Net loss (gain) arising during period (43) (17) (32)
Amortization or settlement recognition of net actuarial (loss) gain 13 11 3
Amortization of prior service (cost) credit 3 2 3
Total recognized in total other comprehensive loss (income)(a) (27) (4) (26)
Total recognized in net benefit cost (credit) and other comprehensive loss (income) $ (52) $ (22) $ (43)