Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Financing Revenue and Other Interest Income [Abstract]
Interest and Fee Income, Loans and Leases	$ 1,307	$ 1,166	$ 3,807	$ 3,358
Interest and Fee Income, Loans and Leases Held-for Sale	0	2	0	40
Interest and Dividend Income, Securities, Operating, Available-for-sale	101	102	302	283
Interest Income, Deposits with Financial Institutions	3	2	10	6
Operating Leases, Income Statement, Lease Revenue	649	830	2,119	2,586
Total financing revenue and other interest income	2,060	2,102	6,238	6,273
Interest Expense [Abstract]
Interest Expense, Deposits	212	181	608	530
Interest Expense, Short-term Borrowings	14	13	39	36
Interest Expense, Long-term Debt	430	410	1,308	1,258
Interest Expense	656	604	1,955	1,824
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	408	528	1,352	1,713
Net Financing Revenue	996	970	2,931	2,736
Other revenue [Abstract]
Insurance Services Revenue	238	236	704	706
Gain (Loss) on Sales of Loans, Net	0	(2)	4	45
Gain (Loss) on Extinguishment of Debt	0	0	(4)	(354)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	52	6	145	106
Noninterest Income, Other Operating Income	98	92	289	283
Nonoperating Income (Expense)	388	332	1,138	786
Revenues	1,384	1,302	4,069	3,522
Provision for Loan Losses Expensed	258	211	650	467
Noninterest Expense [Abstract]
Labor and Related Expense	248	235	742	726
Policyholder Benefits and Claims Incurred, Net	69	61	287	239
Other Noninterest Expense	418	378	1,189	1,128
Noninterest Expense	735	674	2,218	2,093
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	391	417	1,201	962
Income Tax Expense (Benefit)	130	144	336	341
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	261	273	865	621
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(52)	(5)	(46)	405
Net Income (Loss) Attributable to Parent	209	268	819	1,026
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(4)	61	262	(56)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 205	$ 329	$ 1,081	$ 970
Earnings Per Share, Basic [Abstract]
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.54	$ 0.49	$ 1.73	$ (1.52)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.11)	(0.01)	(0.10)	0.84
Earnings Per Share, Basic	0.43	0.48	1.63	(0.68)
Earnings Per Share, Diluted [Abstract]
Income (Loss) from Continuing Operations, Per Diluted Share	0.54	0.49	1.72	(1.52)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.11)	(0.01)	(0.10)	0.84
Earnings Per Share, Diluted	0.43	0.47	1.63	(0.68)
Common Stock, Dividends, Per Share, Declared	$ 0.08	$ 0	$ 0.08	$ 0.00