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Share-based Compensation and Employee Benefits - Components of Funded Status (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Non-current benefit asset $ 0 $ 0
Current benefit liability 0 0
Non-current benefit liability (645) (620)
Funded status - net (liability) asset at December 31, (645) (620)
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Non-current benefit asset 269 231
Current benefit liability (19) (18)
Non-current benefit liability (188) (213)
Funded status - net (liability) asset at December 31, 62 0
OPEB | Other Affiliates    
Defined Benefit Plan Disclosure [Line Items]    
Non-current benefit asset $ 46 $ 39