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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Gain Loss By Type Of Derivative Tables |  |
Electric Production Expense | $ 1,321 | $ 1,295
Cash Flow Hedging [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (21) | 4
Gain Loss By Type Of Derivative Tables |  |
Gain (Losses) Recognized in AOCL | (13) | (85)
Gains (Losses) Recognized in Earnings (ineffective portion) | 0 | 2
Cash Flow Hedging [Member] | Commodity Contract [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 1 | 22
Gain Loss By Type Of Derivative Tables |  |
Gain (Losses) Recognized in AOCL | 12 | 37
Cash Flow Hedging [Member] | Foreign currency derivatives [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (2) | 2
Gain Loss By Type Of Derivative Tables |  |
Gain (Losses) Recognized in AOCL | (15) | 0
Cash Flow Hedging [Member] | Cross currency derivatives [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 4 | 9
Gain Loss By Type Of Derivative Tables |  |
Gain (Losses) Recognized in AOCL | 12 | 8
Cash Flow Hedging [Member] | Interest Rate Contract [Member] |  |
Derivative Instruments Gain Loss [Line Items] |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (24) | (29)
Gain Loss By Type Of Derivative Tables |  |
Gain (Losses) Recognized in AOCL | (22) | (130)
Not Designated as Hedging Instrument [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (34) | 33
Not Designated as Hedging Instrument [Member] | Other Contract [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | (2) | (9)
Not Designated as Hedging Instrument [Member] | Foreign currency derivatives [Member] |  |
Gain Loss By Type Of Derivative Tables |  |
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) | $ (32) | $ 40

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Cost incurred directly related to electricity produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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