Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 453	$ 619
Cash and cash equivalents, interest-bearing	5,708	2,936
Total cash and cash equivalents	6,161	3,555
Equity securities	941	616
Available-for-sale securities	29,181	30,284
Held-to-maturity securities	1,497	1,568
Loans held-for-sale, net	235	158
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	128,139	128,231
Allowance for loan losses	3,245	1,263
Total finance receivables and loans, net	124,894	126,968
Investment in operating leases, net	9,064	8,864
Premiums receivable and other insurance assets	2,576	2,558
Other assets	7,978	6,073
Total assets	182,527	180,644
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	139	119
Deposit liabilities, interest-bearing	122,185	120,633
Total deposit liabilities	122,324	120,752
Short-term borrowings	9,493	5,531
Long-term debt	31,066	34,027
Interest payable	710	641
Unearned insurance premiums and service revenue	3,305	3,305
Accrued expenses and other liabilities	2,110	1,972
Total liabilities	169,008	166,228
Equity [Abstract]
Common Stocks, Including Additional Paid in Capital	21,470	21,438
Accumulated deficit	(5,465)	(4,057)
Accumulated other comprehensive income (loss)	706	123
Treasury stock, at cost	(3,192)	(3,088)
Total equity	13,519	14,416
Total liabilities and equity	182,527	180,644
On-balance sheet variable interest entities
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	18,801	18,710
Allowance for loan losses	436	153
Total finance receivables and loans, net	18,365	18,557
Other assets	871	787
Total assets	19,236	19,344
Liabilities and Equity [Abstract]
Long-term debt	8,148	9,087
Accrued expenses and other liabilities	12	11
Total liabilities	$ 8,160	$ 9,098