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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ (173) | $ 3 | $ 111 | $ (70)
Other comprehensive income (loss) before reclassifications | 8 | 42 | (20) | 129
Amounts reclassified from AOCI | 7 | 3 | 21 | 0
Total other comprehensive income, net of tax | 15 | 45 | 1 | 129
Impact of NEP deconsolidation | 0 | 0 | 58 | 0
Adoption of accounting standards updates | (328) |  | (328) |
Less other comprehensive income attributable to noncontrolling interests |  | 0 |  | (11)
Ending balance | (158) | 48 | (158) | 48
Net Unrealized Gains (Losses) on Cash Flow Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (67) | (96) | (77) | (100)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 7 | 10 | 21 | 24
Total other comprehensive income, net of tax | 7 | 10 | 21 | 24
Impact of NEP deconsolidation |  |  | 3 |
Adoption of accounting standards updates | (7) |  | (7) |
Less other comprehensive income attributable to noncontrolling interests |  | 1 |  | (9)
Ending balance | (60) | (85) | (60) | (85)
Net Unrealized Gains (Losses) on Available for Sale Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (5) | 268 | 316 | 225
Other comprehensive income (loss) before reclassifications | (2) | 31 | (11) | 91
Amounts reclassified from AOCI | 0 | (6) | 0 | (23)
Total other comprehensive income, net of tax | (2) | 25 | (11) | 68
Impact of NEP deconsolidation |  |  | 0 |
Adoption of accounting standards updates | (312) |  | (312) |
Less other comprehensive income attributable to noncontrolling interests |  | 0 |  | 0
Ending balance | (7) | 293 | (7) | 293
Defined Benefit Pension and Other Benefits Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (51) | (76) | (39) | (83)
Other comprehensive income (loss) before reclassifications | (1) | 0 | (4) | 7
Amounts reclassified from AOCI | 0 | (1) | 0 | (1)
Total other comprehensive income, net of tax | (1) | (1) | (4) | 6
Impact of NEP deconsolidation |  |  | 0 |
Adoption of accounting standards updates | (9) |  | (9) |
Less other comprehensive income attributable to noncontrolling interests |  | 0 |  | 0
Ending balance | (52) | (77) | (52) | (77)
Net Unrealized Gains (Losses) on Foreign Currency Translation |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (52) | (71) | (69) | (90)
Other comprehensive income (loss) before reclassifications | 10 | 10 | (10) | 30
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Total other comprehensive income, net of tax | 10 | 10 | (10) | 30
Impact of NEP deconsolidation |  |  | 37 |
Adoption of accounting standards updates | 0 |  | 0 |
Less other comprehensive income attributable to noncontrolling interests |  | (1) |  | (2)
Ending balance | (42) | (62) | (42) | (62)
Other Comprehensive Income (Loss) Related to Equity Method Investees |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 2 | (22) | (20) | (22)
Other comprehensive income (loss) before reclassifications | 1 | 1 | 5 | 1
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Total other comprehensive income, net of tax | 1 | 1 | 5 | 1
Impact of NEP deconsolidation |  |  | 18 |
Adoption of accounting standards updates | 0 |  | 0 |
Less other comprehensive income attributable to noncontrolling interests |  | 0 |  | 0
Ending balance | $ 3 | $ (21) | $ 3 | $ (21)

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