Commitments and Guarantees (Analysis of Indemnification and Repurchase Liability for Asserted and Unasserted Claims) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Total Indemnification and Repurchase Liability
Loss Contingencies [Line Items]
Reserves, Beginning balance	$ 153,000,000	$ 672,000,000
Reserve adjustments, net	20,000,000	(53,000,000)
Reserves, Ending balance	136,000,000	153,000,000
Total Indemnification and Repurchase Liability \| Loan repurchases and private investor settlements [Member]
Loss Contingencies [Line Items]
Losses	(37,000,000)	(275,000,000)
Total Indemnification and Repurchase Liability \| Agency settlements [Member]
Loss Contingencies [Line Items]
Losses		(191,000,000)
Residential Mortgages [Member]
Loss Contingencies [Line Items]
Repurchase obligations - sold loan portfolios	57,400,000,000	91,900,000,000
Residential Mortgages [Member] \| Total Indemnification and Repurchase Liability
Loss Contingencies [Line Items]
Reserves, Beginning balance	131,000,000	614,000,000
Reserve adjustments, net	0	(53,000,000)
Reserves, Ending balance	107,000,000	131,000,000
Residential Mortgages [Member] \| Total Indemnification and Repurchase Liability \| Loan repurchases and private investor settlements [Member]
Loss Contingencies [Line Items]
Losses	(24,000,000)	(239,000,000)
Residential Mortgages [Member] \| Total Indemnification and Repurchase Liability \| Agency settlements [Member]
Loss Contingencies [Line Items]
Losses		(191,000,000)
Home Equity [Member]
Loss Contingencies [Line Items]
Repurchase obligations - sold loan portfolios	2,500,000,000	2,800,000,000
Prior Period Reduction For Correction Of Error		800,000,000
Home Equity [Member] \| Total Indemnification and Repurchase Liability
Loss Contingencies [Line Items]
Reserves, Beginning balance	22,000,000	58,000,000
Reserve adjustments, net	20,000,000	0
Reserves, Ending balance	29,000,000	22,000,000
Home Equity [Member] \| Total Indemnification and Repurchase Liability \| Loan repurchases and private investor settlements [Member]
Loss Contingencies [Line Items]
Losses	$ (13,000,000)	$ (36,000,000)

Prior period reduction of repurchase obligations - sold loan portfolios

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Balance of loan portfolios previously sold relating to reserves recorded as of the balance sheet for indemnification and repurchase obligations.

+ References

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Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Amount of payments made reducing loss contingency liability.

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Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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