Parent and Guarantor Consolidating Financial Statements (Schedule of Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Condensed Income Statements, Captions [Line Items]
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, 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, Related Party	0	0	0	0
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
Dividends from Bank Subsidiary				0
Dividends From Non Bank Subsidiary	0	0	0	0
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
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
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
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
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	(15)	(33)	(82)	(45)
Interest and Fee Income, Loans and Leases Held-for Sale		0		0
Interest and Dividend Income, Securities, Operating, Available-for-sale	0	0	0	0
Interest Income, Deposits with Financial Institutions	1	0	4	1
Operating Leases, Income Statement, Lease Revenue	4	1	14	1
Total financing revenue and other interest income	(8)	(29)	(56)	(28)
Interest Expense, Deposits	2	3	6	8
Interest Expense, Short-term Borrowings	10	10	31	30
Interest Expense, Long-term Debt	289	272	868	856
Interest Expense, Related Party	5	3	14	28
Interest Expense	306	288	919	922
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	3	1	11	1
Net Financing Revenue	(317)	(318)	(986)	(951)
Dividends from Bank Subsidiary				525
Dividends From Non Bank Subsidiary	170	494	800	980
Insurance Services Revenue	0	0	0	0
Gain (Loss) on Sales of Loans, Net	(7)	(1)	(11)	(9)
Gain (Loss) on Extinguishment of Debt			(2)	(353)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0	0	0
Noninterest Income, Other Operating Income	298	367	989	1,045
Nonoperating Income (Expense)	291	366	976	683
Revenues	144	542	790	1,237
Provision for Loan Losses Expensed	147	48	295	111
Labor and Related Expense	143	138	430	431
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Other Noninterest Expense	307	315	963	935
Noninterest Expense	450	453	1,393	1,366
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(453)	41	(898)	(240)
Income Tax Expense (Benefit)	(88)	(30)	(196)	(231)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(365)	71	(702)	(9)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(47)	(5)	(39)	367
Undistributed income of bank subsidiaries	325	254	932	302
Undistributed income of nonbank subsidiaries	296	(52)	628	366
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
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	0	0	0	0
Interest and Fee Income, Loans and Leases Held-for Sale		0		0
Interest and Dividend Income, Securities, Operating, Available-for-sale	0	0	0	0
Interest Income, Deposits with Financial Institutions	0	0	0	0
Operating Leases, Income Statement, Lease Revenue	0	0	0	0
Total financing revenue and other interest income	0	0	0	0
Interest Expense, Deposits	0	0	0	0
Interest Expense, Short-term Borrowings	0	0	0	0
Interest Expense, Long-term Debt	0	0	0	0
Interest Expense, Related Party	0	0	0	0
Interest Expense	0	0	0	0
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	0	0	0	0
Net Financing Revenue	0	0	0	0
Dividends from Bank Subsidiary				525
Dividends From Non Bank Subsidiary	0	0	0	0
Insurance Services Revenue	0	0	0	0
Gain (Loss) on Sales of Loans, Net	0	0	0	0
Gain (Loss) on Extinguishment of Debt			0	0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0	0	0
Noninterest Income, Other Operating Income	0	0	0	0
Nonoperating Income (Expense)	0	0	0	0
Revenues	0	0	0	525
Provision for Loan Losses Expensed	0	0	0	0
Labor and Related Expense	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Other Noninterest Expense	0	0	0	0
Noninterest Expense	0	0	0	0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	0	0	0	525
Income Tax Expense (Benefit)	0	0	(82)	0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	0	0	82	525
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	0	0
Undistributed income of bank subsidiaries	325	254	932	302
Undistributed income of nonbank subsidiaries	0	(1)	(2)	(1)
Net Income (Loss) Attributable to Parent	325	253	1,012	826
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3)	65	143	40
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	322	318	1,155	866
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	1,322	1,199	3,889	3,403
Interest and Fee Income, Loans and Leases Held-for Sale		2		40
Interest and Dividend Income, Securities, Operating, Available-for-sale	102	102	303	283
Interest Income, Deposits with Financial Institutions	2	2	6	5
Operating Leases, Income Statement, Lease Revenue	645	829	2,105	2,585
Total financing revenue and other interest income	2,075	2,137	6,316	6,344
Interest Expense, Deposits	210	178	602	522
Interest Expense, Short-term Borrowings	4	3	8	6
Interest Expense, Long-term Debt	141	138	440	402
Interest Expense, Related Party	2	3	8	15
Interest Expense	357	322	1,058	945
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	405	527	1,341	1,712
Net Financing Revenue	1,313	1,288	3,917	3,687
Dividends from Bank Subsidiary				0
Dividends From Non Bank Subsidiary	0	0	0	0
Insurance Services Revenue	238	236	704	706
Gain (Loss) on Sales of Loans, Net	7	(1)	15	54
Gain (Loss) on Extinguishment of Debt			(2)	(1)
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	52	6	145	106
Noninterest Income, Other Operating Income	231	329	661	1,019
Nonoperating Income (Expense)	528	570	1,523	1,884
Revenues	1,841	1,858	5,440	5,571
Provision for Loan Losses Expensed	111	163	355	356
Labor and Related Expense	105	212	312	634
Policyholder Benefits and Claims Incurred, Net	69	61	287	239
Other Noninterest Expense	541	552	1,586	1,635
Noninterest Expense	715	825	2,185	2,508
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	1,015	870	2,900	2,707
Income Tax Expense (Benefit)	218	174	614	572
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	797	696	2,286	2,135
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(5)	0	(7)	38
Undistributed income of bank subsidiaries	0	0	0	0
Undistributed income of nonbank subsidiaries	0	0	0	0
Net Income (Loss) Attributable to Parent	792	696	2,279	2,173
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(9)	55	234	(64)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	783	751	2,513	2,109
Affiliated Entity [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	0	0	0	0
Interest Income, Deposits with Financial Institutions	0	0	0	0
Affiliated Entity [Member] | Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	2	3	8	15
Interest Income, Deposits with Financial Institutions	0	0	0	0
Affiliated Entity [Member] | Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	0	0	0	0
Interest Income, Deposits with Financial Institutions	0	0	0	0
Affiliated Entity [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	2	1	6	22
Interest Income, Deposits with Financial Institutions	2	2	7	6
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	0	0	0	0
Interest and Fee Income, Loans and Leases Held-for Sale		0		0
Interest and Dividend Income, Securities, Operating, Available-for-sale	(1)	0	(1)	0
Interest Income, Deposits with Financial Institutions	0	0	0	0
Operating Leases, Income Statement, Lease Revenue	0	0	0	0
Total financing revenue and other interest income	(7)	(6)	(22)	(43)
Interest Expense, Deposits	0	0	0	0
Interest Expense, Short-term Borrowings	0	0	0	0
Interest Expense, Long-term Debt	0	0	0	0
Interest Expense, Related Party	(7)	(6)	(22)	(43)
Interest Expense	(7)	(6)	(22)	(43)
Operating Leases, Income Statement, Depreciation Expense on Property Subject to or Held-for-lease	0	0	0	0
Net Financing Revenue	0	0	0	0
Dividends from Bank Subsidiary				(1,050)
Dividends From Non Bank Subsidiary	(170)	(494)	(800)	(980)
Insurance Services Revenue	0	0	0	0
Gain (Loss) on Sales of Loans, Net	0	0	0	0
Gain (Loss) on Extinguishment of Debt			0	0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	0	0	0
Noninterest Income, Other Operating Income	(431)	(604)	(1,361)	(1,781)
Nonoperating Income (Expense)	(431)	(604)	(1,361)	(1,781)
Revenues	(601)	(1,098)	(2,161)	(3,811)
Provision for Loan Losses Expensed	0	0	0	0
Labor and Related Expense	0	(115)	0	(339)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Other Noninterest Expense	(430)	(489)	(1,360)	(1,442)
Noninterest Expense	(430)	(604)	(1,360)	(1,781)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(171)	(494)	(801)	(2,030)
Income Tax Expense (Benefit)	0	0	0	0
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	(171)	(494)	(801)	(2,030)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	0	0	0	0
Undistributed income of bank subsidiaries	(650)	(508)	(1,864)	(604)
Undistributed income of nonbank subsidiaries	(296)	53	(626)	(365)
Net Income (Loss) Attributable to Parent	(1,117)	(949)	(3,291)	(2,999)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	12	(120)	(377)	24
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(1,105)	(1,069)	(3,668)	(2,975)
Consolidation, Eliminations [Member] | Affiliated Entity [Member]
Condensed Income Statements, Captions [Line Items]
Interest and Fee Income, Loans and Leases	(4)	(4)	(14)	(37)
Interest Income, Deposits with Financial Institutions	$ (2)	$ (2)	$ (7)	$ (6)