Consolidated Statement Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 610	$ 758
Depreciation and amortization	1,241	1,466
Provision for loan losses	392	256
Gain on mortgage and automotive loans, net	(4)	(47)
Other gain on investments, net	(93)	(100)
Loss on extinguishment of debt	4	354
Originations and purchases of loans held-for-sale	(44)	(1,528)
Proceeds from sales and repayments of loans originated as held-for-sale	144	496
Gain on sale of subsidiaries, net	0	(452)
Deferred income taxes	193	258
Interest payable	76	(59)
Other assets	17	532
Other liabilities	(55)	(217)
Other, net	(59)	26
Net cash provided by (used in) operating activities	2,422	1,743
Net Cash Provided by Investing Activities [Abstract]
Purchases of available-for-sale securities	(8,657)	(8,165)
Proceeds from sales of available-for-sale securities	6,584	2,865
Proceeds from maturities and repayment of available-for-sale securities	1,536	2,192
Purchases of held-to-maturity securities	(571)	0
Net (increase) decrease in finance receivables and loans	(5,653)	(5,471)
Proceeds from sales of finance receivables and loans originated as held-for-investment	4,156	1,582
Purchases of operating lease assets	(1,472)	(2,348)
Disposals of operating lease assets	3,047	2,709
Payments to Acquire Interest in Subsidiaries and Affiliates	(288)	0
Proceeds from sale of business units, net	0	1,049
Increase (Decrease) in Restricted Cash	482	449
Net change in nonmarketable equity investments	(354)	88
Other, net	(69)	(142)
Net cash provided by investing activities	(1,259)	(5,192)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Net change in short-term borrowings	(2,112)	2,945
Net increase in bank deposits	6,308	3,713
Proceeds from issuance of long-term debt	9,020	17,818
Repayments of long-term debt	(14,305)	(18,984)
Repurchase and Redemption of Preferred Stock	(696)	(442)
Dividends paid on preferred stock	(30)	(1,318)
Net cash (used in) provided by financing activities	(1,815)	3,732
Effect of exchange-rate changes on cash and cash equivalents	3	(1)
Net (decrease) increase in cash and cash equivalents	(649)	282
Cash and cash equivalents at beginning of period	6,380	5,576
Cash and cash equivalents at end of period	5,731	5,858
Supplemental Cash Flow Information [Abstract]
Interest	1,234	1,250
Income taxes	12	97
Finance receivables and loans transferred to loans held-for-sale	4,174	72
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 18	$ 54