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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair value hierarchy for recurring measurements table | The following table presents, by level within the fair value hierarchy, as described in Note 1—General and Summary of Significant Accounting Policies, the Company's financial assets and liabilities (in millions) that were measured at fair value on a recurring basis as of the periods indicated:
|  | December 31, 2015 |  | December 31, 2014
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AVAILABLE FOR SALE: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities:(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured debentures |  | $ | — |  |  | $ | 327 |  |  | $ | — |  |  | $ | 327 |  |  | $ | — |  |  | $ | 501 |  |  | $ | — |  |  | $ | 501 |
Certificates of deposit |  | — |  |  | 135 |  |  | — |  |  | 135 |  |  | — |  |  | 151 |  |  | — |  |  | 151 |
Government debt securities |  | — |  |  | 28 |  |  | — |  |  | 28 |  |  | — |  |  | 57 |  |  | — |  |  | 57 |
Subtotal |  | — |  |  | 490 |  |  | — |  |  | 490 |  |  | — |  |  | 709 |  |  | — |  |  | 709 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | — |  |  | 15 |  |  | — |  |  | 15 |  |  | — |  |  | 25 |  |  | — |  |  | 25 |
Subtotal |  | — |  |  | 15 |  |  | — |  |  | 15 |  |  | — |  |  | 25 |  |  | — |  |  | 25 |
Total available for sale |  | — |  |  | 505 |  |  | — |  |  | 505 |  |  | — |  |  | 734 |  |  | — |  |  | 734 |
TRADING: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | 15 |  |  | — |  |  | — |  |  | 15 |  |  | 15 |  |  | — |  |  | — |  |  | 15 |
Total trading |  | 15 |  |  | — |  |  | — |  |  | 15 |  |  | 15 |  |  | — |  |  | — |  |  | 15 |
DERIVATIVES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency derivatives |  | — |  |  | 35 |  |  | 292 |  |  | 327 |  |  | — |  |  | 18 |  |  | 218 |  |  | 236 |
Commodity derivatives |  | — |  |  | 41 |  |  | 7 |  |  | 48 |  |  | — |  |  | 37 |  |  | 7 |  |  | 44 |
Total derivatives |  | — |  |  | 76 |  |  | 299 |  |  | 375 |  |  | — |  |  | 55 |  |  | 225 |  |  | 280 |
TOTAL ASSETS |  | $ | 15 |  |  | $ | 581 |  |  | $ | 299 |  |  | $ | 895 |  |  | $ | 15 |  |  | $ | 789 |  |  | $ | 225 |  |  | $ | 1,029 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DERIVATIVES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives |  | $ | — |  |  | $ | 54 |  |  | $ | 304 |  |  | $ | 358 |  |  | $ | — |  |  | $ | 206 |  |  | $ | 210 |  |  | $ | 416 |
Cross currency derivatives |  | — |  |  | 43 |  |  | — |  |  | 43 |  |  | — |  |  | 29 |  |  | — |  |  | 29 |
Foreign currency derivatives |  | — |  |  | 41 |  |  | 15 |  |  | 56 |  |  | — |  |  | 43 |  |  | 9 |  |  | 52 |
Commodity derivatives |  | — |  |  | 29 |  |  | 4 |  |  | 33 |  |  | — |  |  | 16 |  |  | 1 |  |  | 17 |
Total derivatives |  | — |  |  | 167 |  |  | 323 |  |  | 490 |  |  | — |  |  | 294 |  |  | 220 |  |  | 514 |
TOTAL LIABILITIES |  | $ | — |  |  | $ | 167 |  |  | $ | 323 |  |  | $ | 490 |  |  | $ | — |  |  | $ | 294 |  |  | $ | 220 |  |  | $ | 514 |
_____________________________
(1) | Amortized cost approximated fair value at December 31, 2015 and 2014.
Derivatives Level 3 Rollforward Table | The following tables present a reconciliation of net derivative assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2015 and 2014 (presented net by type of derivative in millions). Transfers between Level 3 and Level 2 are determined as of the end of the reporting period and principally result from changes in the significance of unobservable inputs used to calculate the credit valuation adjustment.
Year Ended December 31, 2015 | Interest Rate |  | Foreign Currency |  | Commodity |  | Total
Balance at January 1 | $ | (210 | ) |  | $ | 209 |  |  | $ | 6 |  |  | $ | 5 |
Total gains (losses) (realized and unrealized): |  |  |  |  |  |  |
Included in earnings | (1 | ) |  | 198 |  |  | (1 | ) |  | 196 |
Included in other comprehensive income - derivative activity | (31 | ) |  | — |  |  | — |  |  | (31 | )
Included in other comprehensive income - foreign currency translation activity | 9 |  |  | (103 | ) |  | — |  |  | (94 | )
Included in regulatory (assets) liabilities | — |  |  | — |  |  | (18 | ) |  | (18 | )
Settlements | 24 |  |  | (7 | ) |  | 16 |  |  | 33 |
Transfers of assets (liabilities) into Level 3 | (95 | ) |  | (1 | ) |  | — |  |  | (96 | )
Transfers of (assets) liabilities out of Level 3 | — |  |  | (19 | ) |  | — |  |  | (19 | )
Balance at December 31 | $ | (304 | ) |  | $ | 277 |  |  | $ | 3 |  |  | $ | (24 | )
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period | $ | — |  |  | $ | 187 |  |  | $ | (1 | ) |  | $ | 186 |
Year Ended December 31, 2014 | Interest Rate |  | Foreign Currency |  | Commodity |  | Total
Balance at January 1 | $ | (101 | ) |  | $ | 93 |  |  | $ | 4 |  |  | $ | (4 | )
Total gains (losses) (realized and unrealized): |  |  |  |  |  |  |
Included in earnings | 2 |  |  | 134 |  |  | 1 |  |  | 137 |
Included in other comprehensive income - derivative activity | (154 | ) |  | (2 | ) |  | — |  |  | (156 | )
Included in other comprehensive income - foreign currency translation activity | 13 |  |  | (25 | ) |  | — |  |  | (12 | )
Included in regulatory (assets) liabilities | — |  |  | — |  |  | 16 |  |  | 16 |
Settlements | 30 |  |  | (4 | ) |  | (15 | ) |  | 11 |
Transfers of assets (liabilities) into Level 3 | — |  |  | 10 |  |  | — |  |  | 10 |
Transfers of (assets) liabilities out of Level 3 | — |  |  | 3 |  |  | — |  |  | 3 |
Balance at December 31 | $ | (210 | ) |  | $ | 209 |  |  | $ | 6 |  |  | $ | 5 |
Total gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities held at the end of the period | $ | 2 |  |  | $ | 130 |  |  | $ | (1 | ) |  | $ | 131 |
Significant unobservable inputs, recurring | The following table summarizes the significant unobservable inputs used for the Level 3 derivative assets (liabilities) as of December 31, 2015:
Type of Derivative |  | Fair Value |  | Unobservable Input |  | Amount or Range (Weighted Average)
|  | (in millions) |  |  |  |
Interest rate |  | $ | (304 | ) |  | Subsidiaries’ credit spreads |  | 2.88%-8.88% (5.42%) |
Foreign currency: |  |  |  |  |  |
Argentine Peso |  | 291 |  |  | Argentine Peso to U.S. Dollar currency exchange rate after 1 year |  | 17.51 - 35.44 (26.05) |
Euro |  | (14 | ) |  | Subsidiary's credit spread |  | 8.88 | %
Commodity: |  |  |  |  |  |
Other |  | 3 |  |  |  |  |
Total |  | $ | (24 | ) |  |  |  |
Fair value hierarchy for nonrecurring measurements table | The following table summarizes major categories of assets and liabilities measured at fair value on a nonrecurring basis during the period and their level within the fair value hierarchy (in millions):
|  | Measurement Date |  | Carrying Amount |  | Fair Value |  | Pretax Loss
Year Ended December 31, 2015 |  |  | Level 1 |  | Level 2 |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets held and used:(1) |  |  |  |  |  |  |  |  |  |  |  |
Kilroot |  | 08/28/2015 |  | $ | 191 |  |  | $ | — |  |  | $ | — |  |  | $ | 70 |  |  | $ | 121 |
Buffalo Gap III |  | 09/30/2015 |  | 234 |  |  | — |  |  | — |  |  | 118 |  |  | 116 |
U.K. Wind (Development Projects) |  | 06/30/2015 |  | 38 |  |  | — |  |  | 1 |  |  | — |  |  | 37 |
Other |  | Various |  | 32 |  |  | — |  |  | 21 |  |  | — |  |  | 11 |
Equity method investments (3) |  |  |  |  |  |  |  |  |  |  |  |
Solar Spain |  | 02/09/2015 |  | 29 |  |  | — |  |  | — |  |  | 29 |  |  | — |
Goodwill(5) |  |  |  |  |  |  |  |  |  |  |  |
DP&L |  | 10/01/2015 |  | 317 |  |  | — |  |  | — |  |  | — |  |  | 317 |
|  | Measurement Date |  | Carrying Amount |  | Fair Value |  | Pretax Loss
Year Ended December 31, 2014 |  |  | Level 1 |  | Level 2 |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets held and used:(1) |  |  |  |  |  |  |  |  |  |  |  |
DP&L (East Bend) |  | 03/31/2014 |  | $ | 14 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | 12 |
Ebute |  | 06/30/2014 |  | 99 |  |  | — |  |  | — |  |  | 47 |  |  | 52 |
Ebute |  | 09/30/2014 |  | 51 |  |  | — |  |  | — |  |  | 36 |  |  | 15 |
U.K. Wind (Newfield) |  | 06/06/2014 |  | 12 |  |  | — |  |  | — |  |  | — |  |  | 12 |
Discontinued operations:(2) |  |  |  |  |  |  |  |  |  |  |  |
Cameroon businesses |  | 03/31/2014 |  | 372 |  |  | — |  |  | 334 |  |  | — |  |  | 38 |
Equity method investments (4) |  |  |  |  |  |  |  |  |  |  |  |
Silver Ridge Power |  | 06/30/2014 |  | 315 |  |  | — |  |  | — |  |  | 273 |  |  | 42 |
Entek |  | 09/25/2014 |  | 211 |  |  | — |  |  | 125 |  |  | — |  |  | 86 |
Goodwill(5) |  |  |  |  |  |  |  |  |  |  |  |
DPLER |  | 02/28/2014 |  | 136 |  |  | — |  |  | — |  |  | — |  |  | 136 |
Buffalo Gap |  | 03/31/2014 |  | 28 |  |  | — |  |  | — |  |  | — |  |  | 28 |
_____________________________
(1) | See Note 21—Asset Impairment Expense for further information.
(2) | See Note 23—Discontinued Operations for further information. Fair value of long-lived assets held-for-sale is presented net of costs to sell.
(3) | See Note 8—Investments In and Advances to Affiliates for further information.
(4) | See Note 9—Other Non-Operating Expense for further information.
(5) | See Note 10—Goodwill and Other Intangible Assets for further information.
Significant unobservable inputs, nonrecurring | The following table summarizes the significant unobservable inputs used in the Level 3 measurement of long-lived assets and equity method investments during the year ended December 31, 2015:
|  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average)
|  | (in millions) |  |  |  |  |  | ($ in millions)
Long-lived assets held and used: |  |  |  |  |  |  |  |
Kilroot |  | $ | 70 |  |  | Discounted cash flow |  | Annual revenue growth |  | -88% to 6% (-7%)
|  |  |  |  |  | Annual pretax operating margin |  | -74% to 10% (0%)
|  |  |  |  |  | Weighted Average Cost of Capital |  | 6%
Buffalo Gap |  | 118 |  |  | Discounted cash flow |  | Annual revenue growth |  | -2% to 19% (3%)
|  |  |  |  |  | Annual pretax operating margin |  | -282% to 58% (24%)
|  |  |  |  |  | Weighted Average Cost of Capital |  | 9%
Equity method investment: |  |  |  |  |  |  |  |
Solar Spain |  | 29 |  |  | Discounted cash flow |  | Annual revenue growth |  | -3% to 0% (0%)
|  |  |  |  |  | Annual pretax operating margin |  | -13% to 56% (24%)
|  |  |  |  |  | Cost of equity |  | 12%
Total |  | $ | 217 |  |  |  |  |  |  |
Financial instruments not measured at fair value in the condensed consolidated balance sheets | The following table presents in millions the carrying amount, fair value and fair value hierarchy of the Company's financial assets and liabilities that are not measured at fair value in the Consolidated Balance Sheets as of December 31, 2015 and 2014, but for which fair value is disclosed.
|  | Carrying Amount |  | Fair Value
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
December 31, 2015 |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |
Accounts receivable — noncurrent(1) |  | $ | 270 |  |  | $ | 342 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 322 |
Liabilities |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  | 15,792 |  |  | 15,939 |  |  | — |  |  | 13,672 |  |  | 2,267 |
Recourse debt |  | 5,015 |  |  | 4,696 |  |  | — |  |  | 4,696 |  |  | — |
December 31, 2014 |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |
Accounts receivable — noncurrent(1) |  | $ | 257 |  |  | $ | 246 |  |  | $ | — |  |  | $ | — |  |  | $ | 246 |
Liabilities |  |  |  |  |  |  |  |  |  |
Non-recourse debt |  | 15,600 |  |  | 16,008 |  |  | — |  |  | 12,538 |  |  | 3,470 |
Recourse debt |  | 5,258 |  |  | 5,552 |  |  | — |  |  | 5,552 |  |  | — |
_____________________________
(1) | These accounts receivable principally relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in Noncurrent assets — Other in the accompanying Consolidated Balance Sheets. The fair value of these accounts receivable excludes value-added tax of $27 million and $36 million at December 31, 2015 and 2014, respectively.

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- Definition This element represents, for the fair value measurement of derivative assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (net); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) + References No definition available. + Details
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- Definition Tabular disclosure of the financial instruments not carried on the balance sheet at fair value by class and level of within the fair value hierarchy. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19296-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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