Consolidated Statement Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 758	$ 550
Depreciation, Amortization and Accretion, Net	1,466	1,415
Provision for Loan Losses Expensed Including Discontinued Operations	256	200
Gain Loss on Sales of Loans Net Including Discontinued Operations	(47)	(6)
Available-for-sale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	(100)	(84)
Gains (Losses) on Extinguishment of Debt	354	46
Payments for Origination and Purchases of Loans Held-for-sale	(1,528)	0
Proceeds from Sale of Loans Held-for-sale	496	59
Total Charge Recorded Related to ResCap Bankruptcy	0	(150)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	(452)	7
Deferred income taxes	258	117
Interest payable	(59)	(359)
Other assets	532	150
Other liabilities	(217)	(428)
Other, net	26	(4)
Net cash provided by (used in) operating activities	1,743	1,513
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of available-for-sale securities	(8,165)	(2,411)
Proceeds from sales of available-for-sale securities	2,865	2,144
Proceeds from maturities of available-for-sale securities	2,192	1,136
Net (increase) decrease in finance receivables and loans	(5,471)	(736)
Proceeds from Sale of Loans Held-for-investment	1,582	0
Purchases of operating lease assets	(2,348)	(5,182)
Disposals of operating lease assets	2,709	2,993
Proceeds from sale of business units, net	1,049	47
Increase (Decrease) in Restricted Cash	449	2,060
Other, net	(54)	39
Net cash (used in) provided by investing activities	(5,192)	90
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	2,945	(2,181)
Net increase in bank deposits	3,724	2,741
Proceeds from issuance of long-term debt	17,807	14,956
Repayments of long-term debt	(18,984)	(16,739)
Repurchase and Redemption of Preferred Stock	(442)	0
Dividends paid	(1,318)	(134)
Net cash provided by (used in) financing activities	3,732	(1,357)
Effect of exchange-rate changes on cash and cash equivalents	(1)	0
Cash and Cash Equivalents, Period Increase (Decrease)	282	246
Cash and cash equivalents at beginning of period	5,576	5,531
Cash and cash equivalents at end of period	5,858	5,777
Supplemental Cash Flow Information [Abstract]
Interest	1,250	1,730
Income taxes	97	0
Transfer of Portfolio Loans and Leases to Held-for-sale	72	40
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 54	$ 20