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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

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