Consolidated Statement Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 1,026	$ 973
Depreciation, Amortization and Accretion, Net	2,130	2,133
Provision for Loan Losses Expensed Including Discontinued Operations	467	302
Gain Loss on Sales of Loans Net Including Discontinued Operations	(45)	(6)
Available-for-sale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	(106)	(129)
Gains (Losses) on Extinguishment of Debt	354	46
Payments for Origination and Purchases of Loans Held-for-sale	(1,594)	0
Proceeds from Sale of Loans Held-for-sale	1,580	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	406	174
Interest payable	(40)	(346)
Other assets	528	42
Other liabilities	(212)	(529)
Other, net	(88)	(118)
Net cash provided by (used in) operating activities	3,954	2,458
Net Cash Provided by (Used in) Investing Activities [Abstract]
Purchases of available-for-sale securities	(10,011)	(4,117)
Proceeds from sales of available-for-sale securities	4,408	2,974
Proceeds from maturities of available-for-sale securities	3,141	1,877
Net (increase) decrease in finance receivables and loans	(9,175)	(1,267)
Proceeds from Sale of Loans Held-for-investment	2,665	1,557
Purchases of operating lease assets	(3,423)	(7,770)
Disposals of operating lease assets	3,855	4,505
Proceeds from sale of business units, net	1,049	47
Increase (Decrease) in Restricted Cash	489	2,128
Other, net	(17)	71
Net cash (used in) provided by investing activities	(7,019)	5
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(1,692)	(3,298)
Net increase in bank deposits	5,819	3,501
Proceeds from issuance of long-term debt	23,844	18,942
Repayments of long-term debt	(23,454)	(21,239)
Repurchase and Redemption of Preferred Stock	(442)	0
Dividends paid	(1,356)	(200)
Net cash provided by (used in) financing activities	2,719	(2,294)
Effect of exchange-rate changes on cash and cash equivalents	(3)	(1)
Cash and Cash Equivalents, Period Increase (Decrease)	(349)	168
Cash and cash equivalents at beginning of period	5,576	5,531
Cash and cash equivalents at end of period	5,227	5,699
Supplemental Cash Flow Information [Abstract]
Interest	1,825	2,380
Income taxes	95	13
Transfer of Portfolio Loans and Leases to Held-for-sale	777	1,602
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 61	$ 29