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Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Marketable Securities [Table Text Block] | The following table presents gross proceeds from the sale of AFS securities during the periods indicated (in millions):
| Three Months Ended March 31,
| 2018 |  | 2017
Gross proceeds from sale of AFS securities | $ | 147 |  |  | $ | 429 |
Fair value hierarchy for recurring measurements table | The following table presents, by level within the fair value hierarchy, the Company’s financial assets and liabilities that were measured at fair value on a recurring basis as of the dates indicated (in millions). For the Company’s investments in marketable debt securities, the security classes presented are determined based on the nature and risk of the security and are consistent with how the Company manages, monitors and measures its marketable securities:
| March 31, 2018 |  | December 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT SECURITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured debentures | $ | — |  |  | $ | 291 |  |  | $ | — |  |  | $ | 291 |  |  | $ | — |  |  | $ | 207 |  |  | $ | — |  |  | $ | 207 |
Certificates of deposit | — |  |  | 260 |  |  | — |  |  | 260 |  |  | — |  |  | 153 |  |  | — |  |  | 153 |
Total debt securities | — |  |  | 551 |  |  | — |  |  | 551 |  |  | — |  |  | 360 |  |  | — |  |  | 360 |
EQUITY SECURITIES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds | 20 |  |  | 52 |  |  | — |  |  | 72 |  |  | 20 |  |  | 52 |  |  | — |  |  | 72 |
Other equity securities | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | — |
Total equity securities | 20 |  |  | 55 |  |  | — |  |  | 75 |  |  | 20 |  |  | 52 |  |  | — |  |  | 72 |
DERIVATIVES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | — |  |  | 42 |  |  | — |  |  | 42 |  |  | — |  |  | 15 |  |  | — |  |  | 15 |
Cross-currency derivatives | — |  |  | 45 |  |  | — |  |  | 45 |  |  | — |  |  | 29 |  |  | — |  |  | 29 |
Foreign currency derivatives | — |  |  | 37 |  |  | 225 |  |  | 262 |  |  | — |  |  | 29 |  |  | 240 |  |  | 269 |
Commodity derivatives | — |  |  | 8 |  |  | 3 |  |  | 11 |  |  | — |  |  | 30 |  |  | 5 |  |  | 35 |
Total derivatives — assets | — |  |  | 132 |  |  | 228 |  |  | 360 |  |  | — |  |  | 103 |  |  | 245 |  |  | 348 |
TOTAL ASSETS | $ | 20 |  |  | $ | 738 |  |  | $ | 228 |  |  | $ | 986 |  |  | $ | 20 |  |  | $ | 515 |  |  | $ | 245 |  |  | $ | 780 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DERIVATIVES: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives | $ | — |  |  | $ | 81 |  |  | $ | 129 |  |  | $ | 210 |  |  | $ | — |  |  | $ | 111 |  |  | $ | 151 |  |  | $ | 262 |
Cross-currency derivatives | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Foreign currency derivatives | — |  |  | 41 |  |  | — |  |  | 41 |  |  | — |  |  | 30 |  |  | — |  |  | 30 |
Commodity derivatives | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 19 |  |  | 1 |  |  | 20 |
Total derivatives — liabilities | — |  |  | 124 |  |  | 129 |  |  | 253 |  |  | — |  |  | 163 |  |  | 152 |  |  | 315 |
TOTAL LIABILITIES | $ | — |  |  | $ | 124 |  |  | $ | 129 |  |  | $ | 253 |  |  | $ | — |  |  | $ | 163 |  |  | $ | 152 |  |  | $ | 315 |
Fair Value, Net Derivative Assets (Liabilities) measured on a recurring basis, Unobservable Input Reconciliation 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 three months ended March 31, 2018 and 2017 (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.
Three Months Ended March 31, 2018 | Interest Rate |  | Foreign Currency |  | Commodity |  | Total
Balance at January 1 | $ | (151 | ) |  | $ | 240 |  |  | $ | 4 |  |  | $ | 93 |
Total realized and unrealized gains (losses): |  |  |  |  |  |  |
Included in earnings | 14 |  |  | (6 | ) |  | 1 |  |  | 9 |
Included in other comprehensive income — derivative activity | 27 |  |  | — |  |  | — |  |  | 27 |
Settlements | 6 |  |  | (9 | ) |  | (2 | ) |  | (5 | )
Transfers of liabilities into Level 3 | (8 | ) |  | — |  |  | — |  |  | (8 | )
Transfers of liabilities out of Level 3 | (17 | ) |  | — |  |  | — |  |  | (17 | )
Balance at March 31 | $ | (129 | ) |  | $ | 225 |  |  | $ | 3 |  |  | $ | 99 |
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 | $ | 16 |  |  | $ | (15 | ) |  | $ | 1 |  |  | $ | 2 |
Three Months Ended March 31, 2017 | Interest Rate |  | Foreign Currency |  | Commodity |  | Total
Balance at January 1 | $ | (179 | ) |  | $ | 255 |  |  | $ | 5 |  |  | $ | 81 |
Total realized and unrealized losses: |  |  |  |  |  |  |
Included in earnings | — |  |  | (16 | ) |  | — |  |  | (16 | )
Included in other comprehensive income — derivative activity | (12 | ) |  | — |  |  | — |  |  | (12 | )
Settlements | 10 |  |  | (8 | ) |  | (3 | ) |  | (1 | )
Transfers of liabilities into Level 3 | (4 | ) |  | — |  |  | — |  |  | (4 | )
Transfers of assets out of Level 3 | 2 |  |  | — |  |  | — |  |  | 2 |
Balance at March 31 | $ | (183 | ) |  | $ | 231 |  |  | $ | 2 |  |  | $ | 50 |
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 |  |  | $ | (24 | ) |  | $ | — |  |  | $ | (22 | )
Derivative Assets, Significant unobservable inputs | The following table summarizes the significant unobservable inputs used for Level 3 derivative assets (liabilities) as of March 31, 2018 (in millions, except range amounts):
Type of Derivative |  | Fair Value |  | Unobservable Input |  | Amount or Range (Weighted Average)
Interest rate |  | $ | (129 | ) |  | Subsidiaries’ credit spreads |  | 2.38% to 4.38% (3.54%)
Foreign currency: |  |  |  |  |  |
Argentine Peso |  | 225 |  |  | Argentine Peso to USD currency exchange rate after one year |  | 24.33 to 56.28 (38.75)
Commodity: |  |  |  |  |  |
Other |  | 3 |  |  |  |  |
Total |  | $ | 99 |  |  |  |  |
Fair value hierarchy for nonrecurring measurements table | The following table summarizes our major categories of assets and liabilities measured at fair value on a nonrecurring basis and their level within the fair value hierarchy (in millions):
| Measurement Date |  | Carrying Amount (1) |  | Fair Value |  | Pretax Loss
Three Months Ended March 31, 2017 |  | Level 1 |  | Level 2 |  | Level 3 |
Long-lived assets held and used: (2) |  |  |  |  |  |  |  |  |  |  |
DPL | 02/28/2017 |  | $ | 77 |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |  |  | $ | 66 |
Other | 02/28/2017 |  | 15 |  |  | — |  |  | — |  |  | 7 |  |  | 8 |
Held-for-sale businesses: (3) |  |  |  |  |  |  |  |  |  |  |
Kazakhstan | 03/31/2017 |  | 171 |  |  | — |  |  | 29 |  |  | — |  |  | 94 |
_____________________________
(1) | Represents the carrying values at the dates of measurement, before fair value adjustment.
(2) | See Note 14—Asset Impairment Expense for further information.
(3) | Per the Company’s policy, pretax loss is limited to the impairment of long-lived assets. Any additional loss will be recognized on completion of the sale. See Note 17—Held-for-Sale Businesses and Dispositions for further information
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 Condensed Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017, but for which fair value is disclosed:
|  | March 31, 2018
|  | Carrying Amount |  | Fair Value
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: | Accounts receivable — noncurrent (1) | $ | 156 |  |  | $ | 295 |  |  | $ | — |  |  | $ | — |  |  | $ | 295 |
Liabilities: | Non-recourse debt | 15,626 |  |  | 16,006 |  |  | — |  |  | 14,250 |  |  | 1,756 |
| Recourse debt | 4,065 |  |  | 4,173 |  |  | — |  |  | 4,173 |  |  | — |
|  | December 31, 2017
|  | Carrying Amount |  | Fair Value
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: | Accounts receivable — noncurrent (1) | $ | 163 |  |  | $ | 217 |  |  | $ | — |  |  | $ | 6 |  |  | $ | 211 |
Liabilities: | Non-recourse debt | 15,340 |  |  | 15,890 |  |  | — |  |  | 13,350 |  |  | 2,540 |
| Recourse debt | 4,630 |  |  | 4,920 |  |  | — |  |  | 4,920 |  |  | — |
_____________________________
(1) | These amounts primarily relate to amounts due from CAMMESA, the administrator of the wholesale electricity market in Argentina, and are included in Other noncurrent assets in the accompanying Condensed Consolidated Balance Sheets. The fair value and carrying amount of these receivables exclude VAT of $30 million and $31 million as of March 31, 2018 and December 31, 2017, respectively.

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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 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: 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=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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