Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 723	$ 810
Cash and cash equivalents, interest-bearing	2,894	3,727
Total cash and cash equivalents	3,617	4,537
Equity securities	570	773
Available-for-sale securities	29,384	25,303
Held-to-maturity securities	2,618	2,362
Loans held-for-sale, net	1,000	314
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net of unearned income	128,609	129,926
Allowance for loan losses	1,277	1,242
Total finance receivables and loans, net	127,332	128,684
Investment in operating leases, net	8,653	8,417
Premiums receivable and other insurance assets	2,521	2,326
Other assets	5,790	6,153
Total assets	181,485	178,869
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	156	142
Deposit liabilities, interest-bearing	119,074	106,036
Total deposit liabilities	119,230	106,178
Short-term borrowings	5,335	9,987
Long-term debt	35,730	44,193
Interest payable	894	523
Unearned insurance premiums and service revenue	3,246	3,044
Accrued expenses and other liabilities	2,600	1,676
Total liabilities	167,035	165,601
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,417	21,345
Accumulated deficit	(4,368)	(5,489)
Accumulated other comprehensive income (loss)	190	(539)
Treasury stock, at cost	(2,789)	(2,049)
Total equity	14,450	13,268
Total liabilities and equity	181,485	178,869
Variable interest entity
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net of unearned income	17,816	18,086
Allowance for loan losses	129	114
Total finance receivables and loans, net	17,687	17,972
Investment in operating leases, net	63	164
Other assets	713	767
Total assets	18,463	18,903
Liabilities and Equity [Abstract]
Long-term debt	8,906	10,482
Accrued expenses and other liabilities	13	12
Total liabilities	$ 8,919	$ 10,494