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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, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Prior service benefit | $ 0 | $ (12)
Unrecognized losses (gains) | (120) | 48
Amortization of prior service cost (benefit) | 1 | (1)
Total | $ (119) | $ 35

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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 The 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 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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