| **Fair Value Measurements (Details 7) - USD ($) $ in Millions**                                                   | 3 Months Ended | 9 Months Ended |         |
|-------------------------------------------------------------------------------------------------------------------|----------------|----------------|---------|
||
| Level Two                                                                                                         |           |           |    |   |   |
| **Debt**                                                                                                          |           |           |    |   |   |
| Fair value of debt                                                                                                | $ 1,300        |           | $ 1,300 |   | $ 1,300 |
| Level Two | Market based approach                                                                                 |           |           |    |   |   |
| **Debt**                                                                                                          |           |           |    |   |   |
| Fair value of debt                                                                                                | 609            |           | 609     |   |   |
| Level Two | Observable spreads and terms for recent pricing of similar instruments                                |           |           |    |   |   |
| **Debt**                                                                                                          |           |           |    |   |   |
| Fair value of debt                                                                                                | 725            |           | 725     |   |   |
| Gain on loans held for sale, net                                                                                  |           |           |    |   |   |
| **Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets** |           |           |    |   |   |
| Unrealized Gain or Loss for Level 3 Fair Value instruments                                                        | 42             | $ 27           | 43      | $ 26 |   |
| Change in fair value of mortgage servicing rights                                                                 |           |           |    |   |   |
| **Unrealized gains (losses) related to assets and liabilities included in Condensed Consolidated Balance Sheets** |           |           |    |   |   |
| Unrealized Gain or Loss for Level 3 Fair Value instruments                                                        | $ (9)          | $ (72)         | $ (174) | $ 9 |   |

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| - References
No definition available.
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| - References
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| - Definition
Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using 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 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258
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| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
+ References
No definition available.
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