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Accounting for Derivative Instruments and Hedging Activities - Effect on Accumulated OCI Balance Attributable to Cash Flow Hedge Derivatives, Net (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income [Roll Forward] |
Beginning balance | $ 1,968
Sale of NRG Yield and Renewables | 25
Ending balance | (1,234)
Interest rate contracts | AOCI Including Portion Attributable to Noncontrolling Interest |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income [Roll Forward] |
Beginning balance | (54)
Ending balance | 0
Interest rate contracts | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income [Roll Forward] |
Due to realization of previously deferred amounts | 8
Interest rate contracts | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income [Roll Forward] |
Mark-to-market of cash flow hedge accounting contracts | $ 21

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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- Definition Amount, after tax and adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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