Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Held-to-maturity Securities, Fair Value	$ 1,063	$ 789
Assets [Abstract]
Cash and Due from Banks	1,513	1,547
Interest-bearing Deposits in Banks and Other Financial Institutions	2,789	4,387
Cash and Cash Equivalents, at Carrying Value	4,302	5,934
Available-for-sale securities	20,308	18,926
Held-to-maturity securities	1,104	839
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	1	0
Finance receivables and loans, net [Abstract]
Loans and Leases Receivable, Gross	119,002	118,944
Loans and Leases Receivable, Allowance	(1,155)	(1,144)
Loans and Leases Receivable, Net Amount	117,847	117,800
Property Subject to or Available for Operating Lease, Net	10,461	11,470
Premiums receivable and other insurance assets	1,944	1,905
Other Assets	6,134	6,854
Assets	162,101	163,728
Liabilities and Equity [Abstract]
Noninterest-bearing deposit liabilities	102	84
Interest-bearing Deposit Liabilities	84,384	78,938
Deposits	84,486	79,022
Short-term Debt	8,371	12,673
Long-term Debt	51,061	54,128
Interest payable	382	351
Unearned Premiums	2,514	2,500
Accounts Payable and Accrued Liabilities	1,922	1,737
Liabilities	148,736	150,411
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital, Net of Discount	21,187	21,166
Retained Earnings (Accumulated Deficit)	(6,975)	(7,151)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(321)	(341)
Treasury stock, Value	(526)	(357)
Stockholders' Equity Attributable to Parent, Total	13,365	13,317
Liabilities and Equity	162,101	163,728
Variable Interest Entity, Primary Beneficiary [Member]
Finance receivables and loans, net [Abstract]
Loans and Leases Receivable, Gross	22,550	24,630
Loans and Leases Receivable, Allowance	(154)	(173)
Loans and Leases Receivable, Net Amount	22,396	24,457
Property Subject to or Available for Operating Lease, Net	1,273	1,745
Other Assets	914	1,390
Assets	24,583	27,592
Liabilities and Equity [Abstract]
Long-term Debt	13,331	13,259
Accounts Payable and Accrued Liabilities	12	12
Liabilities	$ 13,343	$ 13,271