Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Cash and Due from Banks	$ 1,547	$ 2,148
Interest-bearing Deposits in Banks and Other Financial Institutions	4,387	4,232
Cash and Cash Equivalents, at Carrying Value	5,934	6,380
Available-for-sale securities	18,926	17,157
Held-to-maturity securities	839	0
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	0	105
Finance receivables and loans, net [Abstract]
Loans and Leases Receivable, Gross	118,944	111,600
Loans and Leases Receivable, Allowance	(1,144)	(1,054)
Loans and Leases Receivable, Net Amount	117,800	110,546
Property Subject to or Available for Operating Lease, Net	11,470	16,271
Premiums receivable and other insurance assets	1,905	1,801
Other Assets	6,854	6,321
Assets	163,728	158,581
Liabilities and Equity [Abstract]
Noninterest-bearing deposit liabilities	84	89
Interest-bearing Deposit Liabilities	78,938	66,389
Deposits	79,022	66,478
Short-term Debt	12,673	8,101
Long-term Debt	54,128	66,234
Interest payable	351	350
Unearned Premiums	2,500	2,434
Accounts Payable and Accrued Liabilities	1,737	1,545
Liabilities	150,411	145,142
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital, Net of Discount	21,166	21,100
Non U S Dept Of Treasury Held Preferred Stock And APIC	0	696
Retained Earnings (Accumulated Deficit)	(7,151)	(8,110)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(341)	(231)
Treasury stock, Value	(357)	(16)
Stockholders' Equity Attributable to Parent, Total	13,317	13,439
Liabilities and Equity	163,728	158,581
Variable Interest Entity, Primary Beneficiary [Member]
Finance receivables and loans, net [Abstract]
Loans and Leases Receivable, Gross	24,630	27,929
Loans and Leases Receivable, Allowance	(173)	(196)
Loans and Leases Receivable, Net Amount	24,457	27,733
Property Subject to or Available for Operating Lease, Net	1,745	4,791
Other Assets	1,390	1,624
Assets	27,592	34,148
Liabilities and Equity [Abstract]
Long-term Debt	13,259	20,267
Accounts Payable and Accrued Liabilities	12	22
Liabilities	$ 13,271	$ 20,289