Consolidated Statement Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 250	$ 576
Depreciation and amortization	653	759
Provision for loan losses	220	116
Gain on mortgage and automotive loans, net	(1)	(46)
Other gain on investments, net	(54)	(55)
Loss on extinguishment of debt	4	198
Originations and purchases of loans held-for-sale	(44)	(1,241)
Proceeds from sales and repayments of loans originated as held-for-sale	104	125
Gain on sale of subsidiaries, net	0	(452)
Deferred income taxes	147	165
Interest payable	24	(37)
Other assets	46	396
Other liabilities	(122)	(92)
Other, net	(39)	(165)
Net cash provided by (used in) operating activities	1,188	247
Net Cash Provided by Investing Activities [Abstract]
Net change in federal funds sold and securities purchased under resale agreements	0	(50)
Purchases of available-for-sale securities	(4,870)	(4,023)
Proceeds from sales of available-for-sale securities	4,175	1,523
Proceeds from maturities and repayment of available-for-sale securities	409	914
Purchases of held-to-maturity securities	(118)	0
Net (increase) decrease in finance receivables and loans	(2,086)	(45)
Proceeds from sales of finance receivables and loans originated as held-for-investment	2,594	1,577
Purchases of operating lease assets	(701)	(1,447)
Disposals of operating lease assets	1,535	1,337
Proceeds from sale of business units, net	0	1,049
Increase (Decrease) in Restricted Cash	48	(121)
Net change in nonmarketable equity investments	(315)	58
Other, net	(20)	33
Net cash provided by investing activities	651	805
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(2,739)	(618)
Net increase in bank deposits	3,780	2,647
Proceeds from issuance of long-term debt	4,244	8,825
Repayments of long-term debt	(8,490)	(9,778)
Dividends paid on preferred stock	(15)	(67)
Net cash (used in) provided by financing activities	(3,220)	1,009
Effect of exchange-rate changes on cash and cash equivalents	2	(1)
Net (decrease) increase in cash and cash equivalents	(1,379)	2,060
Cash and cash equivalents at beginning of period	6,380	5,576
Cash and cash equivalents at end of period	5,001	7,636
Supplemental Cash Flow Information [Abstract]
Interest	626	641
Income taxes	0	95
Finance receivables and loans transferred to loans held-for-sale	2,599	69
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 9	$ 43