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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2018
Text Block [Abstract] |
Changes In The Components Of AOCI |
|  |  |  | Unrealized |  |  |  | Instrument-Specific |  |
|  |  |  | Gains (Losses) |  |  |  | Credit Risk of |  |
|  |  |  | on AFS |  | Foreign Currency |  | Liabilities Measured |  |
| In millions |  | Securities, Net |  | Translation, Net |  | at Fair Value, Net |  | Total
| Balance, December 31, 2017 |  | $ | (10) |  | $ | (9) |  | $ | - |  | $ | (19)
| ASU 2016-01 transition adjustment |  |  | (2) |  |  | - |  |  | (162) |  |  | (164)
| ASU 2018-02 transition adjustment |  |  | (3) |  |  | - |  |  | - |  |  | (3)
| Net period other comprehensive income (loss) |  |  | (39) |  |  | 2 |  |  | (32) |  |  | (69)
| Balance, June 30, 2018 |  | $ | (54) |  | $ | (7) |  | $ | (194) |  | $ | (255)
Reclassifications From AOCI |
In millions |  | Amounts Reclassified from AOCI |  |
|  |  | Three Months Ended June 30, |  | Six Months Ended June 30, |  |
Details about AOCI Components |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Affected Line Item on the Consolidated Statements of Operations
Unrealized gains (losses) on |  |  |  |  |  |  |  |  |  |  |  |  |  |
| AFS securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Realized gains (losses) on sale of securities |  | $ | - |  | $ | 4 |  | $ | 1 |  | $ | 6 |  | Net gains (losses) on financial instruments at fair value and foreign exchange
| OTTI |  |  | - |  |  | - |  |  | (1) |  |  | (2) |  | Net investment losses related to OTTI
| Amortization on securities |  |  | - |  |  | (1) |  |  | - |  |  | (1) |  | Net investment income
|  |  |  | - |  |  | 3 |  |  | - |  |  | 3 |  | Income (loss) before income taxes
|  |  |  | - |  |  | (1) |  |  | - |  |  | (1) |  | Provision (benefit) for income taxes
Total reclassifications for the period |  | $ | - |  | $ | 4 |  | $ | - |  | $ | 4 |  | Net income (loss)

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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