Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 659	$ 810
Cash and cash equivalents, interest-bearing	2,904	3,727
Total cash and cash equivalents	3,563	4,537
Equity securities	591	773
Available-for-sale securities	28,688	25,303
Held-to-maturity securities	2,461	2,362
Loans held-for-sale, net	275	314
Finance receivables and loans, net of unearned income	129,210	129,926
Finance receivables and loans, net [Abstract]
Allowance for loan losses	1,282	1,242
Total finance receivables and loans, net	127,928	128,684
Investment in operating leases, net	8,407	8,417
Premiums receivable and other insurance assets	2,460	2,326
Other assets	6,075	6,153
Total assets	180,448	178,869
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	162	142
Deposit liabilities, interest-bearing	116,163	106,036
Total deposit liabilities	116,325	106,178
Short-term borrowings	6,519	9,987
Long-term debt	37,466	44,193
Interest payable	744	523
Unearned insurance premiums and service revenue	3,171	3,044
Accrued Liabilities and Other Liabilities	1,907	1,676
Total liabilities	166,132	165,601
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,403	21,345
Accumulated deficit	(4,682)	(5,489)
Accumulated other comprehensive loss	84	(539)
Treasury stock, at cost	(2,489)	(2,049)
Total equity	14,316	13,268
Total liabilities and equity	180,448	178,869
Variable interest entity
Assets [Abstract]
Finance receivables and loans, net of unearned income	16,101	18,086
Finance receivables and loans, net [Abstract]
Allowance for loan losses	98	114
Total finance receivables and loans, net	16,003	17,972
Investment in operating leases, net	90	164
Other assets	614	767
Total assets	16,707	18,903
Liabilities and Equity [Abstract]
Long-term debt	9,030	10,482
Accrued Liabilities and Other Liabilities	11	12
Total liabilities	$ 9,041	$ 10,494