Business Segments and Revenue from Contracts with Customers - Segment Results and Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income (loss)	$ 27,114	$ 24,171	$ 22,913
Non-interest income (loss)	7,136	6,264	5,610
Total net revenue (loss)	34,250	30,435	28,523
Provision (benefit) for credit losses	5,847	(1,944)	10,264
Non-interest expense	19,163	16,570	15,056
Income (loss) from continuing operations before income taxes	9,240	15,809	3,203
Income tax provision (benefit)	1,880	3,415	486
Income (loss) from continuing operations, net of tax	7,360	12,394	2,717
Total loans held for investment	312,331	277,340	251,624
Total Deposits	332,992	310,980	305,442
Uncollectible portion of billed finance charges and fees	946	629	1,100
Operating segments | Credit Card
Segment Reporting Information [Line Items]
Net interest income (loss)	16,584	14,074	13,776
Non-interest income (loss)	5,771	4,806	3,823
Total net revenue (loss)	22,355	18,880	17,599
Provision (benefit) for credit losses	4,265	(902)	7,327
Non-interest expense	11,627	9,621	8,491
Income (loss) from continuing operations before income taxes	6,463	10,161	1,781
Income tax provision (benefit)	1,536	2,403	420
Income (loss) from continuing operations, net of tax	4,927	7,758	1,361
Total loans held for investment	137,730	114,772	106,956
Total Deposits	0	0	0
Operating segments | Consumer Banking
Segment Reporting Information [Line Items]
Net interest income (loss)	8,965	8,448	7,238
Non-interest income (loss)	469	554	466
Total net revenue (loss)	9,434	9,002	7,704
Provision (benefit) for credit losses	1,173	(521)	1,753
Non-interest expense	5,312	4,711	4,159
Income (loss) from continuing operations before income taxes	2,949	4,812	1,792
Income tax provision (benefit)	699	1,136	425
Income (loss) from continuing operations, net of tax	2,250	3,676	1,367
Total loans held for investment	79,925	77,646	68,888
Total Deposits	270,592	256,407	249,815
Operating segments | Commercial Banking
Segment Reporting Information [Line Items]
Net interest income (loss)	2,461	2,153	2,048
Non-interest income (loss)	1,129	1,148	923
Total net revenue (loss)	3,590	3,301	2,971
Provision (benefit) for credit losses	415	(519)	1,181
Non-interest expense	2,070	1,815	1,706
Income (loss) from continuing operations before income taxes	1,105	2,005	84
Income tax provision (benefit)	262	473	19
Income (loss) from continuing operations, net of tax	843	1,532	65
Total loans held for investment	94,676	84,922	75,780
Total Deposits	40,808	44,809	39,590
Other
Segment Reporting Information [Line Items]
Net interest income (loss)	(896)	(504)	(149)
Non-interest income (loss)	(233)	(244)	398
Total net revenue (loss)	(1,129)	(748)	249
Provision (benefit) for credit losses	(6)	(2)	3
Non-interest expense	154	423	700
Income (loss) from continuing operations before income taxes	(1,277)	(1,169)	(454)
Income tax provision (benefit)	(617)	(597)	(378)
Income (loss) from continuing operations, net of tax	(660)	(572)	(76)
Total loans held for investment	0	0	0
Total Deposits	$ 21,592	$ 9,764	$ 16,037