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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2013
Investment Segment [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Investment The following table summarizes the valuation of the Investment Funds' investments and derivative contracts by the above fair value hierarchy levels as of March 31, 2013 and December 31, 2012:
| March 31, 2013 |  | December 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (in millions)
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic materials | $ | 53 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 62 |  |  | $ | 144 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 153 |
Communications | 1,036 |  |  | 14 |  |  | — |  |  | 1,050 |  |  | 560 |  |  | 16 |  |  | — |  |  | 576 |
Consumer, non-cyclical | 1,894 |  |  | — |  |  | — |  |  | 1,894 |  |  | 1,340 |  |  | — |  |  | — |  |  | 1,340 |
Consumer, cyclical | 337 |  |  | — |  |  | — |  |  | 337 |  |  | 261 |  |  | — |  |  | — |  |  | 261 |
Diversified | 28 |  |  | — |  |  | — |  |  | 28 |  |  | — |  |  | — |  |  | — |  |  | — |
Energy | 1,921 |  |  | 19 |  |  | — |  |  | 1,940 |  |  | 1,052 |  |  | 55 |  |  | — |  |  | 1,107 |
Financial | 234 |  |  | — |  |  | — |  |  | 234 |  |  | 244 |  |  | — |  |  | — |  |  | 244 |
Funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 308 |  |  | — |  |  | 308 |
Technology | 641 |  |  | 525 |  |  | — |  |  | 1,166 |  |  | 325 |  |  | — |  |  | — |  |  | 325 |
Utilities | 2 |  |  | — |  |  | — |  |  | 2 |  |  | 208 |  |  | — |  |  | — |  |  | 208 |
| 6,146 |  |  | 567 |  |  | — |  |  | 6,713 |  |  | 4,134 |  |  | 388 |  |  | — |  |  | 4,522 |
Corporate debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer, cyclical | — |  |  | — |  |  | 290 |  |  | 290 |  |  | — |  |  | — |  |  | 288 |  |  | 288 |
Financial | — |  |  | 15 |  |  | — |  |  | 15 |  |  | — |  |  | 50 |  |  | — |  |  | 50 |
Sovereign debt | — |  |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 5 |  |  | — |  |  | 5 |
Utilities | — |  |  | 30 |  |  | — |  |  | 30 |  |  | — |  |  | 31 |  |  | — |  |  | 31 |
| — |  |  | 48 |  |  | 290 |  |  | 338 |  |  | — |  |  | 86 |  |  | 288 |  |  | 374 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial | — |  |  | 175 |  |  | — |  |  | 175 |  |  | — |  |  | 188 |  |  | — |  |  | 188 |
| 6,146 |  |  | 790 |  |  | 290 |  |  | 7,226 |  |  | 4,134 |  |  | 662 |  |  | 288 |  |  | 5,084 |
Derivative contracts, at fair value(1) | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
| $ | 6,146 |  |  | $ | 791 |  |  | $ | 290 |  |  | $ | 7,227 |  |  | $ | 4,134 |  |  | $ | 662 |  |  | $ | 288 |  |  | $ | 5,084 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consumer, cyclical | $ | 620 |  |  | $ | — |  |  | $ | — |  |  | $ | 620 |  |  | $ | 473 |  |  | $ | — |  |  | $ | — |  |  | $ | 473 |
Funds | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 60 |  |  | — |  |  | 60 |
| 620 |  |  | — |  |  | — |  |  | 620 |  |  | 473 |  |  | 60 |  |  | — |  |  | 533 |
Derivative contracts, at fair value(2) | — |  |  | 478 |  |  | — |  |  | 478 |  |  | — |  |  | 84 |  |  | — |  |  | 84 |
| $ | 620 |  |  | $ | 478 |  |  | $ | — |  |  | $ | 1,098 |  |  | $ | 473 |  |  | $ | 144 |  |  | $ | — |  |  | $ | 617 |
(1) | Included in other assets in our consolidated balance sheets.
(2) | Included in accrued expenses and other liabilities in our consolidated balance sheets.
Schedule of investments measured at fair value with Level 3 Input | The changes in investments measured at fair value for which our Investment segment has used Level 3 input to determine fair value are as follows:
| Three Months Ended March 31,
| 2013 |  | 2012
| (in millions)
Balance at January 1 | $ | 288 |  |  | $ | 289 |
Gross realized and unrealized gains (losses) | 4 |  |  | (13 | )
Gross proceeds | (2 | ) |  | (3 | )
Balance at March 31 | $ | 290 |  |  | $ | 273 |
Other Segments and Holding Company [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Other Segments and Holding Company The following table summarizes the valuation of our Automotive and Energy segments and our Holding Company investments, derivative contracts and other liabilities by the above fair value hierarchy levels as of March 31, 2013 and December 31, 2012:
| March 31, 2013 |  | December 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets | (in millions)
Marketable equity and debt securities | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Trading securities | — |  |  | — |  |  | 125 |  |  | 125 |  |  | — |  |  | — |  |  | 60 |  |  | 60 |
Derivative contracts, at fair value(1) | — |  |  | 1 |  |  | — |  |  | 1 |  |  | — |  |  | 1 |  |  | 21 |  |  | 22 |
| $ | 1 |  |  | $ | 1 |  |  | $ | 125 |  |  | $ | 127 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 81 |  |  | $ | 83 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | $ | — |  |  | $ | 32 |  |  | $ | — |  |  | $ | 32 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |
Derivative contracts, at fair value(2) | — |  |  | 45 |  |  | — |  |  | 45 |  |  | — |  |  | 89 |  |  | — |  |  | 89 |
| $ | — |  |  | $ | 77 |  |  | $ | — |  |  | $ | 77 |  |  | $ | — |  |  | $ | 90 |  |  | $ | — |  |  | $ | 90 |
(1) | Amounts are classified within other assets in our consolidated balance sheets.
(2) | Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.
Holding Company [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of investments measured at fair value with Level 3 Input | The changes in trading securities measured at fair value for which our Holding Company have used Level 3 input to determine fair value are as follows:
| Three Months Ended March 31,
| 2013 |  | 2012
| (in millions)
Balance at January 1 | $ | 81 |  |  | $ | — |
Purchase | 46 |  |  | — |
Gross unrealized losses | (2 | ) |  | — |
Balance at March 31 | $ | 125 |  |  | $ | — |

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- Definition Tabular disclosure of the fair value measurement of assets 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 gains or losses recognized in other comprehensive income (loss), 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, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&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 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7578670&loc=d3e19190-110258 + Details
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