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Employee Retirement Benefits - Unrecognized Amounts (Details) - Pension Benefits [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Components of AOCI: |  |  |
Unrecognized prior service benefit (net of $2 and $2 tax expense, respectively) |  | $ 2 | $ 3
Unrecognized losses (net of $32 and $55 tax benefit, respectively) |  | (49) | (87)
Total |  | (47) | (84)
Tax effects on components of AOCI [Abstract] |  |  |
Tax expense (benefit) related to unrecognized prior service benefit (cost) |  | 2 | 2
Tax expense (benefit) related to unrecognized gain (loss) |  | (32) | (55)
Unrecognized amounts included in regulatory assets (liabilities) [Abstract] |  |  |
Unrecognized prior service benefit |  | (4) | (4)
Unrecognized losses |  | 160 | 280
Total |  | $ 156 | $ 276
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 7.35% |  |

X
- Definition The after tax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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- Definition Tax expense (benefit) related to unrecognized gain (loss) included in accumulated other comprehensive income (loss) yet to be recognized as components of prepaid (accrued) benefit cost. + References No definition available. + Details
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- Definition Amount related to the net of tax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References No definition available. + Details
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- Definition Tax expense (benefit) related to unrecognized prior service benefit (cost) included in accumulated other comprehensive income (loss) yet to be recognized as components of prepaid (accrued) benefit cost. + References No definition available. + Details
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- Definition The total of net (gain) loss, prior service cost (credit), and transition obligations included in regulatory assets (liabilities) that are yet to be recognized as components of prepaid (accrued) benefit cost. + References No definition available. + Details
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- Definition The amount of (gain) loss not yet recognized as a component of prepaid (accrued) benefit cost and is included in regulatory assets (liabilities). + References No definition available. + Details
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- Definition Amount attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of prepaid (accrued) benefit cost and is included in regulatory assets (liabilities). + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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