Condensed Consolidated Balance Sheet & Mini Balance Sheet - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets [Abstract]
Cash and cash equivalents, noninterest-bearing	$ 719	$ 619
Cash and cash equivalents, interest-bearing	19,220	2,936
Total cash and cash equivalents	19,939	3,555
Equity securities	627	616
Available-for-sale securities	29,989	30,284
Held-to-maturity securities, fair value	1,336	1,600
Held-to-maturity securities	1,255	1,568
Loans held-for-sale, net	441	158
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	118,028	128,231
Allowance for loan losses	3,379	1,263
Total finance receivables and loans, net	114,649	126,968
Investment in operating leases, net	9,454	8,864
Premiums receivable and other insurance assets	2,662	2,558
Other assets	6,254	6,073
Total assets	185,270	180,644
Liabilities and Equity [Abstract]
Deposit liabilities, noninterest-bearing	159	119
Deposit liabilities, interest-bearing	134,779	120,633
Total deposit liabilities	134,938	120,752
Short-term borrowings	3,032	5,531
Long-term debt	25,704	34,027
Interest payable	748	641
Unearned insurance premiums and service revenue	3,401	3,305
Accrued expenses and other liabilities	3,321	1,972
Total liabilities	$ 171,144	$ 166,228
Equity [Abstract]
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	1,100,000,000	1,100,000,000
Common stock, shares issued	500,382,748	496,957,805
Common stock, shares outstanding	373,857,264	374,331,998
Common Stocks, Including Additional Paid in Capital	$ 21,517	$ 21,438
Accumulated deficit	(4,893)	(4,057)
Accumulated other comprehensive income (loss)	$ 695	$ 123
Treasury stock, shares	126,525,484	122,625,807
Treasury stock, at cost	$ (3,193)	$ (3,088)
Total equity	14,126	14,416
Total liabilities and equity	185,270	180,644
On-balance sheet variable interest entities
Finance receivables and loans, net [Abstract]
Finance receivables and loans, net	14,779	18,710
Allowance for loan losses	349	153
Total finance receivables and loans, net	14,430	18,557
Other assets	721	787
Total assets	15,151	19,344
Liabilities and Equity [Abstract]
Long-term debt	5,869	9,087
Accrued expenses and other liabilities	6	11
Total liabilities	$ 5,875	$ 9,098