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Employee Retirement Benefits - Net Periodic Income Cost Regulatory Assets (Details) - Pension Benefits [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Service Cost Recognized In Regulatory Assets Liabilities | $ 1 | $ 0
Unrecognized gains | (89) | (113)
Amortization of prior service cost | 1 | 1
Amortization Of Unrecognized Losses Recognized In Regulatory Assets Liabilities | (12) | 0
Total | $ (99) | $ (112)

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- Definition Amortization Of Unrecognized Losses Recognized In Regulatory Assets Liabilities + References No definition available. + Details
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- Definition The amortization of prior service cost component of net periodic benefit (income) cost recognized during the period in regulatory assets (liabilities). + References No definition available. + Details
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- Definition Total components of net periodic benefit (income) cost recognized during the period in regulatory assets (liabilities). + References No definition available. + Details
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- Definition Defined Benefit Plan, Service Cost Recognized In Regulatory Assets Liabilities + References No definition available. + Details
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- Definition The net gains (losses) component of net periodic benefit (income) cost recognized during the period in regulatory assets (liabilities). + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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