Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 619	$ 810
Cash and cash equivalents, interest-bearing	2,936	3,727
Total cash and cash equivalents	3,555	4,537
Equity securities	616	773
Available-for-sale securities	30,284	25,303
Held-to-maturity securities	1,568	2,362
Loans held-for-sale, net	158	314
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	128,231	129,926
Allowance for loan losses	1,263	1,242
Total finance receivables and loans, net	126,968	128,684
Investment in operating leases, net	8,864	8,417
Premiums receivable and other insurance assets	2,558	2,326
Other assets	6,073	6,153
Total assets	180,644	178,869
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	119	142
Deposit liabilities, interest-bearing	120,633	106,036
Total deposit liabilities	120,752	106,178
Short-term borrowings	5,531	9,987
Long-term debt	34,027	44,193
Interest payable	641	523
Unearned insurance premiums and service revenue	3,305	3,044
Accrued expenses and other liabilities	1,972	1,676
Total liabilities	166,228	165,601
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,438	21,345
Accumulated deficit	(4,057)	(5,489)
Accumulated other comprehensive income (loss)	123	(539)
Treasury stock, at cost	(3,088)	(2,049)
Total equity	14,416	13,268
Total liabilities and equity	180,644	178,869
Variable interest entity
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	18,710	18,086
Allowance for loan losses	153	114
Total finance receivables and loans, net	18,557	17,972
Investment in operating leases, net	0	164
Other assets	787	767
Total assets	19,344	18,903
Liabilities and Equity [Abstract]
Long-term debt	9,087	10,482
Accrued expenses and other liabilities	11	12
Total liabilities	$ 9,098	$ 10,494