Commitments, Guarantees, Product Warranties and Other Loss Contingencies (WMC) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Securitizations Lawsuits	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Financial Information For Businesses Held For Sale [Line Items]
Adjustment For Pending Claims For Unmet Representations And Warranties	$ 5,456	$ 8,047
Lawsuit Relating To Representations And Warranties Amount Of Mortgages	1,060	2,887
Revenues and other income (loss)	2,968	23,003	$ 31,136
Earnings (loss) from discontinued operations, net of taxes	(954)	(7,495)	5,855	$ 5,475	$ 5,047
Pending claims, end of period	$ 6,516
Date of lawsuit filing	Jan-07
WMC
Financial Information For Businesses Held For Sale [Line Items]
Adjustment For Pending Claims For Unmet Representations And Warranties	$ 249
Number Of Securitizations Related To Lawsuits Involving repurchase Claims On Loans In Which Adverse Parties Are Securitization Trustees | Securitizations	11
Revenues and other income (loss)	$ (8)	(184)	(291)
Earnings (loss) from discontinued operations, net of taxes	$ (52)	$ (146)	$ (199)
Number Of Lawsuits Involving Repurchase Claims On Loans | Lawsuits	10
WMC | ResCap Liquidating Trust [Member]
Financial Information For Businesses Held For Sale [Line Items]
Date of lawsuit filing	23-Jan-17
Date of bankruptcy filing	May 01, 2012
Proceeds from sale of loans	$ 840
WMC | Lower Limit
Financial Information For Businesses Held For Sale [Line Items]
Increase to Reserve for Claims For Unmet Representations And Warranties	0
WMC | Upper Limit
Financial Information For Businesses Held For Sale [Line Items]
Increase to Reserve for Claims For Unmet Representations And Warranties	$ 500