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v3.19.3

Accounting for Derivative Instruments and Hedging Activities - Effects on Accumulated OCL balance attributable to hedge derivatives, net (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Derivative [Line Items] |  |
Beginning balance | $ 2,071 | $ 1,968
Reclassified from accumulated OCL to income: |  |
Sale of NRG Yield and Renewables Platform | 25 | 25
Ending balance | (936) | (936)
Balance, tax | 0 | 0
AOCI Including Portion Attributable to Noncontrolling Interest | Interest rate contracts |  |
Derivative [Line Items] |  |
Beginning balance | (23) | (54)
Reclassified from accumulated OCL to income: |  |
Ending balance | 0 | 0
Accumulated Gain (Loss), Net, Cash Flow Hedge | Interest rate contracts |  |
Reclassified from accumulated OCL to income: |  |
Due to realization of previously deferred amounts | 1 | 8
Accumulated Net Gain (Loss) from Cash Flow Hedges | Interest rate contracts |  |
Reclassified from accumulated OCL to income: |  |
Mark-to-market of cash flow hedge accounting contracts | $ (3) | $ 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=118930883&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=118930883&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=109980867&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=118930883&loc=SL7669646-108580 + Details
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