Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Originations and repayments of loans held-for-investment and other	$ 8,826	$ 9,344	$ 4,147
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss) Attributable to Parent	1,067	1,289	1,150
Depreciation, Amortization and Accretion, Net	2,382	2,801	2,936
Provision for Loan Losses Expensed Including Discontinued Operations	917	707	457
Gain Loss on Sales of Loans Net Including Discontinued Operations	(11)	(45)	(7)
Availableforsale Securities Gross Realized Gain Loss Excluding Otti Including Disc Ops	(185)	(155)	(181)
Gain (Loss) on Extinguishment of Debt	5	357	202
Payments for Origination and Purchases of Loans Held-for-sale	(141)	(1,770)	0
Proceeds from Sale of Loans Held-for-sale	240	1,658	62
Total Charge Recorded Related to ResCap Bankruptcy	0	0	(150)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0	(452)	7
Increase (Decrease) in Deferred Income Taxes	458	565	117
Increase (Decrease) in Interest Payable, Net	1	(127)	(411)
Increase (Decrease) in Other Operating Assets	(120)	526	(132)
Increase (Decrease) in Other Operating Liabilities	(206)	(247)	(400)
Increase (Decrease) in Other Operating Assets and Liabilities, Net	160	4	(247)
Net cash provided by (used in) operating activities	4,567	5,111	3,403
Net Cash Provided by Investing Activities [Abstract]
Payments to Acquire Available-for-sale Securities	(16,031)	(12,250)	(5,417)
Proceeds from sales of available-for-sale securities	11,036	6,874	4,260
Proceeds from maturities and repayment of available-for-sale securities	3,379	4,255	2,657
Payments to Acquire Held-to-maturity Securities	(841)	0	0
Payments for (Proceeds from) Loans and Leases	(3,859)	(4,501)	(877)
Proceeds from Sale of Loans Held-for-investment	4,285	3,197	2,592
Originations and repayments of loans held-for-investment and other	8,826	9,344	4,147
Purchases of operating lease assets	(3,274)	(4,685)	(9,884)
Disposals of operating lease assets	6,304	5,546	5,860
Payments to Acquire Interest in Subsidiaries and Affiliates	(309)	0	0
Proceeds from Divestiture of Businesses	0	1,049	47
Increase (Decrease) in Restricted Cash	392	264	1,625
Increase (Decrease) in Non marketable equity securities	(628)	(147)	66
Payments for (Proceeds from) Other Investing Activities	(312)	(5)	6
Net cash provided by investing activities	(8,684)	(9,747)	(3,212)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from (Repayments of) Short-term Debt	4,564	1,028	(1,494)
Increase (Decrease) in Deposits	12,508	8,247	4,851
Proceeds from issuance of long-term debt	14,155	30,665	27,192
Repayments of long-term debt	(26,412)	(31,350)	(30,426)
Payments for Repurchase of Redeemable Preferred Stock	(696)	(559)	0
Payments for Repurchase of Common Stock	(341)	(16)	0
Payments of Dividends	(108)	(2,571)	(268)
Net cash (used in) provided by financing activities	3,670	5,444	(145)
Effect of exchange-rate changes on cash and cash equivalents	1	(4)	(1)
Cash and Cash Equivalents, Period Increase (Decrease)	(446)	804	45
Cash and Cash Equivalents, at Carrying Value	6,380	5,576	5,531
Cash and Cash Equivalents, at Carrying Value	5,934	6,380	5,576
Supplemental Cash Flow Information [Abstract]
Interest Paid	2,647	2,632	3,090
Income Taxes Paid	19	96	8
Transfer of Portfolio Loans and Leases to Held-for-sale	4,282	1,311	4,631
Proceeds from sales and repayments of mortgage loans held-for-investment originally designated as held-for-sale	$ 40	$ 68	$ 38