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Commitments, Contingencies and Guarantees (Narrative) (Details) (USD $)
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Mar. 31, 2015
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| ATM Guarantee [Member] | Citishare Network Guarantee [Member] | |
| Commitments, Contingencies and Guarantees [Line Items] | |
| Maximum potential future payment | $ 15,000,000 |
| Commitments to Extend Credit [Member] | |
| Commitments, Contingencies and Guarantees [Line Items] | |
| Unused commitments to extend credit for loans | $ 174,000,000,000 |