Variable Interest Entities (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
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|---|---|---|---|---|
| Variable Interest Entity [Line Items] | ||||
| Financing Receivable, Net | [1] | $ 83,748 | $ 122,457 | |
| Investment in Unconsolidated VIEs [Member] | ||||
| Variable Interest Entity [Line Items] | ||||
| Other assets and investment securities | 601 | 632 | ||
| Financing Receivable, Net | 10 | 120 | ||
| Total investment | 611 | 752 | ||
| Contractual obligations to fund new investments or guarantees | 85 | 27 | ||
| Total | $ 696 | $ 779 | ||
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