Securitizations and Variable Interest Entities (Schedule of Quantitative Information and Net Credit Losses about Securitized and Other Financial Assets Managed Together) (Details) - Off-balance sheet variable interest entities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Total amount	$ 966		$ 966		$ 330
Amount 60 days or more past due	43		43		10
Net credit losses	18	$ 0	35	$ 0
Automotive | Consumer
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Total amount	835		835		227
Amount 60 days or more past due	27		27		2
Net credit losses	10	0	14	0
Consumer other | Consumer
Derecognized Assets, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Total amount	131		131		103
Amount 60 days or more past due	16		16		$ 8
Net credit losses	$ 8	$ 0	$ 21	$ 0