v3.3.1.900

Derivative Instruments (Details 3) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Derivatives | [1],[2] |  |  |  |  |  |  |  |  | $ 450 | $ 110 | $ 86
Unrealized Gain (Loss) on Derivatives | [3] |  |  |  |  |  |  |  |  | (110) | 353 | (12)
Derivatives contracts included in operating revenues |  | $ 1,436 | $ 1,948 | $ 1,442 | $ 1,646 | $ 1,939 | $ 2,187 | $ 1,939 | $ 1,965 | 6,472 | 8,030 | 6,301
Derivatives contracts included in fuel and purchased energy |  |  |  |  |  |  |  |  |  | 3,767 | 4,892 | 3,736
Interest expense |  |  |  |  |  |  |  |  |  | 628 | 645 | 696
Gain (Loss) on Derivative Instruments, Net, Pretax |  |  |  |  |  |  |  |  |  | 340 | 463 | 74
Energy Related Derivative [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Derivatives | [1],[2] |  |  |  |  |  |  |  |  | 450 | 110 | 86
Unrealized Gain (Loss) on Derivatives | [3] |  |  |  |  |  |  |  |  | (113) | 342 | (14)
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives | [3] |  |  |  |  |  |  |  |  | 3 | 11 | 2
Interest expense |  |  |  |  |  |  |  |  |  | 3 | 11 | 2
Power [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives contracts included in operating revenues | [4] |  |  |  |  |  |  |  |  | 528 | 384 | (119)
Natural Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivatives contracts included in fuel and purchased energy | [4] |  |  |  |  |  |  |  |  | $ (191) | $ 68 | $ 191
[1] | Does not include the realized value associated with derivative instruments that settle through physical delivery.
[2] | Includes amortization of acquisition date fair value of derivative activity related the acquisition of Champion Energy.
[3] | In addition to changes in market value on derivatives not designated as hedges, changes in mark-to-market gain (loss) also includes de-designation of interest rate swap cash flow hedges and related reclassification from AOCI into earnings, hedge ineffectiveness and adjustments to reflect changes in credit default risk exposure.
[4] | Does not include the realized value associated with derivative instruments that settle through physical delivery.

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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