Accounting Policies (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	$ 105,070		$ 114,317
Other assets	4,593	$ 3,390	3,398
Deferred income taxes	2,907	2,535	2,593
Retained earnings	9,212	9,703	9,905
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	252		0
Other assets		(8)
Deferred income taxes		(58)
Retained earnings		(202)
Retail Installment loans, dealer financing, and other financing [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	97,043	105,901	106,131
Retail Installment loans, dealer financing, and other financing [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net		(230)
Finance Lease [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net	$ 8,027	8,164	$ 8,186
Finance Lease [Member] | Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Finance receivables, net		$ (22)