Loans and Related Allowance for Credit Losses, Loans by FICO Score, Consumer (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 911,807	$ 895,394	$ 861,572
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	26,665	101,969
Term loans by origination year, fiscal year before current fiscal year	97,218	55,214
Term loans by origination year, two years before current fiscal year	51,577	34,661
Term loans by origination year, three years before current fiscal year	31,181	11,714
Term loans by origination year, four years before current fiscal year	10,286	15,842
Term loans by origination year, more than five years before current fiscal year	83,887	77,309
Revolving loans	77,106	78,564
Revolving loans converted to term loans	7,173	7,001
Loans	385,093	382,274
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	18,441	70,176
Term loans by origination year, fiscal year before current fiscal year	68,614	41,794
Term loans by origination year, two years before current fiscal year	39,789	25,234
Term loans by origination year, three years before current fiscal year	23,082	8,122
Term loans by origination year, four years before current fiscal year	7,322	14,245
Term loans by origination year, more than five years before current fiscal year	82,074	76,380
Revolving loans	14,509	16,305
Revolving loans converted to term loans	6,803	6,632
Loans	260,634	258,888
Residential mortgage - first lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	18,436	70,148
Term loans by origination year, fiscal year before current fiscal year	68,583	41,774
Term loans by origination year, two years before current fiscal year	39,770	25,203
Term loans by origination year, three years before current fiscal year	23,053	8,095
Term loans by origination year, four years before current fiscal year	7,298	14,223
Term loans by origination year, more than five years before current fiscal year	81,367	75,618
Revolving loans	4,728	5,313
Revolving loans converted to term loans	2,007	1,896
Loans	245,242	242,270
Residential mortgage - first lien [Member] | Government insured or guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1	14
Term loans by origination year, fiscal year before current fiscal year	25	134
Term loans by origination year, two years before current fiscal year	124	209
Term loans by origination year, three years before current fiscal year	167	349
Term loans by origination year, four years before current fiscal year	283	364
Term loans by origination year, more than five years before current fiscal year	9,970	12,088
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	10,570	13,158
Residential mortgage - first lien [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	6,959	35,935
Term loans by origination year, fiscal year before current fiscal year	41,019	27,396
Term loans by origination year, two years before current fiscal year	27,546	16,583
Term loans by origination year, three years before current fiscal year	15,795	5,153
Term loans by origination year, four years before current fiscal year	4,757	9,430
Term loans by origination year, more than five years before current fiscal year	43,819	37,495
Revolving loans	2,327	2,554
Revolving loans converted to term loans	533	469
Loans	142,755	135,015
Residential mortgage - first lien [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	8,055	23,645
Term loans by origination year, fiscal year before current fiscal year	18,449	9,814
Term loans by origination year, two years before current fiscal year	8,173	5,412
Term loans by origination year, three years before current fiscal year	4,520	1,464
Term loans by origination year, four years before current fiscal year	1,219	2,485
Term loans by origination year, more than five years before current fiscal year	11,509	10,509
Revolving loans	927	1,073
Revolving loans converted to term loans	280	265
Loans	53,132	54,667
Residential mortgage - first lien [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	2,485	7,842
Term loans by origination year, fiscal year before current fiscal year	6,500	3,083
Term loans by origination year, two years before current fiscal year	2,683	1,980
Term loans by origination year, three years before current fiscal year	1,699	642
Term loans by origination year, four years before current fiscal year	593	1,137
Term loans by origination year, more than five years before current fiscal year	6,619	6,277
Revolving loans	595	646
Revolving loans converted to term loans	256	238
Loans	21,430	21,845
Residential mortgage - first lien [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	707	1,986
Term loans by origination year, fiscal year before current fiscal year	1,811	876
Term loans by origination year, two years before current fiscal year	795	645
Term loans by origination year, three years before current fiscal year	558	283
Term loans by origination year, four years before current fiscal year	250	501
Term loans by origination year, more than five years before current fiscal year	3,739	3,682
Revolving loans	359	393
Revolving loans converted to term loans	208	206
Loans	8,427	8,572
Residential mortgage - first lien [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	164	449
Term loans by origination year, fiscal year before current fiscal year	490	233
Term loans by origination year, two years before current fiscal year	243	187
Term loans by origination year, three years before current fiscal year	149	89
Term loans by origination year, four years before current fiscal year	93	129
Term loans by origination year, more than five years before current fiscal year	1,819	1,851
Revolving loans	167	188
Revolving loans converted to term loans	142	146
Loans	3,267	3,272
Residential mortgage - first lien [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	32	101
Term loans by origination year, fiscal year before current fiscal year	103	63
Term loans by origination year, two years before current fiscal year	62	46
Term loans by origination year, three years before current fiscal year	57	31
Term loans by origination year, four years before current fiscal year	32	41
Term loans by origination year, more than five years before current fiscal year	1,012	1,035
Revolving loans	80	102
Revolving loans converted to term loans	84	89
Loans	1,462	1,508
Residential mortgage - first lien [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1	15
Term loans by origination year, fiscal year before current fiscal year	23	13
Term loans by origination year, two years before current fiscal year	22	24
Term loans by origination year, three years before current fiscal year	14	19
Term loans by origination year, four years before current fiscal year	18	41
Term loans by origination year, more than five years before current fiscal year	1,007	1,083
Revolving loans	103	114
Revolving loans converted to term loans	129	124
Loans	1,317	1,433
Residential mortgage - first lien [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	32	161
Term loans by origination year, fiscal year before current fiscal year	163	162
Term loans by origination year, two years before current fiscal year	122	117
Term loans by origination year, three years before current fiscal year	94	65
Term loans by origination year, four years before current fiscal year	53	95
Term loans by origination year, more than five years before current fiscal year	1,873	1,598
Revolving loans	170	243
Revolving loans converted to term loans	375	359
Loans	2,882	2,800
Residential mortgage - junior lien [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	5	28
Term loans by origination year, fiscal year before current fiscal year	31	20
Term loans by origination year, two years before current fiscal year	19	31
Term loans by origination year, three years before current fiscal year	29	27
Term loans by origination year, four years before current fiscal year	24	22
Term loans by origination year, more than five years before current fiscal year	707	762
Revolving loans	9,781	10,992
Revolving loans converted to term loans	4,796	4,736
Loans	15,392	16,618
Residential mortgage - junior lien [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	170	188
Revolving loans	4,987	5,512
Revolving loans converted to term loans	1,561	1,481
Loans	6,718	7,181
Residential mortgage - junior lien [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	102	110
Revolving loans	1,884	2,154
Revolving loans converted to term loans	809	828
Loans	2,795	3,092
Residential mortgage - junior lien [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	114	130
Revolving loans	1,290	1,462
Revolving loans converted to term loans	777	790
Loans	2,181	2,382
Residential mortgage - junior lien [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	105	118
Revolving loans	752	881
Revolving loans converted to term loans	634	633
Loans	1,491	1,632
Residential mortgage - junior lien [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	56	65
Revolving loans	293	325
Revolving loans converted to term loans	323	338
Loans	672	728
Residential mortgage - junior lien [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	33	39
Revolving loans	141	160
Revolving loans converted to term loans	192	208
Loans	366	407
Residential mortgage - junior lien [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	42	43
Revolving loans	147	164
Revolving loans converted to term loans	210	215
Loans	399	422
Residential mortgage - junior lien [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	5	28
Term loans by origination year, fiscal year before current fiscal year	31	20
Term loans by origination year, two years before current fiscal year	19	31
Term loans by origination year, three years before current fiscal year	29	27
Term loans by origination year, four years before current fiscal year	24	22
Term loans by origination year, more than five years before current fiscal year	85	69
Revolving loans	287	334
Revolving loans converted to term loans	290	243
Loans	770	774
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	38,417	38,243
Revolving loans converted to term loans	222	210
Loans	38,639	38,453
Credit card [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	4,468	4,247
Revolving loans converted to term loans	2	1
Loans	4,470	4,248
Credit card [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	6,070	6,053
Revolving loans converted to term loans	8	7
Loans	6,078	6,060
Credit card [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	8,383	8,475
Revolving loans converted to term loans	27	26
Loans	8,410	8,501
Credit card [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	9,129	9,136
Revolving loans converted to term loans	49	50
Loans	9,178	9,186
Credit card [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	5,866	5,850
Revolving loans converted to term loans	46	47
Loans	5,912	5,897
Credit card [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	2,284	2,298
Revolving loans converted to term loans	32	31
Loans	2,316	2,329
Credit card [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	2,124	2,067
Revolving loans converted to term loans	57	47
Loans	2,181	2,114
Credit card [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	93	117
Revolving loans converted to term loans	1	1
Loans	94	118
Auto [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	7,239	29,566
Term loans by origination year, fiscal year before current fiscal year	26,701	12,700
Term loans by origination year, two years before current fiscal year	11,205	8,717
Term loans by origination year, three years before current fiscal year	7,518	3,386
Term loans by origination year, four years before current fiscal year	2,808	1,490
Term loans by origination year, more than five years before current fiscal year	1,612	800
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	57,083	56,659
Auto [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1,486	4,688
Term loans by origination year, fiscal year before current fiscal year	4,161	1,983
Term loans by origination year, two years before current fiscal year	1,836	1,680
Term loans by origination year, three years before current fiscal year	1,485	690
Term loans by origination year, four years before current fiscal year	586	318
Term loans by origination year, more than five years before current fiscal year	301	108
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	9,855	9,467
Auto [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1,323	4,967
Term loans by origination year, fiscal year before current fiscal year	4,418	2,123
Term loans by origination year, two years before current fiscal year	1,850	1,586
Term loans by origination year, three years before current fiscal year	1,323	586
Term loans by origination year, four years before current fiscal year	471	234
Term loans by origination year, more than five years before current fiscal year	220	87
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	9,605	9,583
Auto [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1,214	4,789
Term loans by origination year, fiscal year before current fiscal year	4,229	2,104
Term loans by origination year, two years before current fiscal year	1,826	1,503
Term loans by origination year, three years before current fiscal year	1,279	583
Term loans by origination year, four years before current fiscal year	473	241
Term loans by origination year, more than five years before current fiscal year	237	106
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	9,258	9,326
Auto [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1,227	5,005
Term loans by origination year, fiscal year before current fiscal year	4,316	2,282
Term loans by origination year, two years before current fiscal year	1,953	1,441
Term loans by origination year, three years before current fiscal year	1,217	526
Term loans by origination year, four years before current fiscal year	427	218
Term loans by origination year, more than five years before current fiscal year	226	111
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	9,366	9,583
Auto [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	1,034	4,611
Term loans by origination year, fiscal year before current fiscal year	4,003	1,824
Term loans by origination year, two years before current fiscal year	1,548	1,025
Term loans by origination year, three years before current fiscal year	859	369
Term loans by origination year, four years before current fiscal year	303	160
Term loans by origination year, more than five years before current fiscal year	179	99
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	7,926	8,088
Auto [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	641	3,118
Term loans by origination year, fiscal year before current fiscal year	2,741	1,114
Term loans by origination year, two years before current fiscal year	952	617
Term loans by origination year, three years before current fiscal year	524	243
Term loans by origination year, four years before current fiscal year	198	117
Term loans by origination year, more than five years before current fiscal year	144	92
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	5,200	5,301
Auto [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	314	2,372
Term loans by origination year, fiscal year before current fiscal year	2,804	1,236
Term loans by origination year, two years before current fiscal year	1,237	853
Term loans by origination year, three years before current fiscal year	816	376
Term loans by origination year, four years before current fiscal year	337	193
Term loans by origination year, more than five years before current fiscal year	291	187
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	5,799	5,217
Auto [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	16
Term loans by origination year, fiscal year before current fiscal year	29	34
Term loans by origination year, two years before current fiscal year	3	12
Term loans by origination year, three years before current fiscal year	15	13
Term loans by origination year, four years before current fiscal year	13	9
Term loans by origination year, more than five years before current fiscal year	14	10
Revolving loans	0	0
Revolving loans converted to term loans	0	0
Loans	74	94
Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	985	2,227
Term loans by origination year, fiscal year before current fiscal year	1,903	720
Term loans by origination year, two years before current fiscal year	583	710
Term loans by origination year, three years before current fiscal year	581	206
Term loans by origination year, four years before current fiscal year	156	107
Term loans by origination year, more than five years before current fiscal year	201	129
Revolving loans	24,180	24,016
Revolving loans converted to term loans	148	159
Loans	28,737	28,274
Other consumer [Member] | FICO 800 or more [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	222	450
Term loans by origination year, fiscal year before current fiscal year	393	162
Term loans by origination year, two years before current fiscal year	147	128
Term loans by origination year, three years before current fiscal year	103	34
Term loans by origination year, four years before current fiscal year	25	8
Term loans by origination year, more than five years before current fiscal year	46	47
Revolving loans	1,171	1,343
Revolving loans converted to term loans	25	22
Loans	2,132	2,194
Other consumer [Member] | FICO 760-799 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	244	502
Term loans by origination year, fiscal year before current fiscal year	407	147
Term loans by origination year, two years before current fiscal year	114	117
Term loans by origination year, three years before current fiscal year	89	33
Term loans by origination year, four years before current fiscal year	23	7
Term loans by origination year, more than five years before current fiscal year	23	22
Revolving loans	715	819
Revolving loans converted to term loans	18	19
Loans	1,633	1,666
Other consumer [Member] | FICO 720-759 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	209	461
Term loans by origination year, fiscal year before current fiscal year	383	134
Term loans by origination year, two years before current fiscal year	103	115
Term loans by origination year, three years before current fiscal year	89	38
Term loans by origination year, four years before current fiscal year	29	9
Term loans by origination year, more than five years before current fiscal year	20	18
Revolving loans	629	714
Revolving loans converted to term loans	20	22
Loans	1,482	1,511
Other consumer [Member] | FICO 680-719 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	153	349
Term loans by origination year, fiscal year before current fiscal year	295	95
Term loans by origination year, two years before current fiscal year	80	99
Term loans by origination year, three years before current fiscal year	79	37
Term loans by origination year, four years before current fiscal year	28	9
Term loans by origination year, more than five years before current fiscal year	19	15
Revolving loans	586	630
Revolving loans converted to term loans	18	22
Loans	1,258	1,256
Other consumer [Member] | FICO 640-679 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	68	170
Term loans by origination year, fiscal year before current fiscal year	156	44
Term loans by origination year, two years before current fiscal year	37	55
Term loans by origination year, three years before current fiscal year	43	21
Term loans by origination year, four years before current fiscal year	16	6
Term loans by origination year, more than five years before current fiscal year	12	8
Revolving loans	306	328
Revolving loans converted to term loans	16	17
Loans	654	649
Other consumer [Member] | FICO 600-639 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	14	42
Term loans by origination year, fiscal year before current fiscal year	46	13
Term loans by origination year, two years before current fiscal year	11	19
Term loans by origination year, three years before current fiscal year	15	9
Term loans by origination year, four years before current fiscal year	7	3
Term loans by origination year, more than five years before current fiscal year	6	4
Revolving loans	111	117
Revolving loans converted to term loans	10	9
Loans	220	216
Other consumer [Member] | FICO less than 600 [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	3	18
Term loans by origination year, fiscal year before current fiscal year	29	12
Term loans by origination year, two years before current fiscal year	12	22
Term loans by origination year, three years before current fiscal year	19	11
Term loans by origination year, four years before current fiscal year	9	3
Term loans by origination year, more than five years before current fiscal year	7	5
Revolving loans	108	114
Revolving loans converted to term loans	11	12
Loans	198	197
Other consumer [Member] | No FICO available [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	72	235
Term loans by origination year, fiscal year before current fiscal year	194	113
Term loans by origination year, two years before current fiscal year	79	155
Term loans by origination year, three years before current fiscal year	144	23
Term loans by origination year, four years before current fiscal year	19	62
Term loans by origination year, more than five years before current fiscal year	68	10
Revolving loans	1,167	1,236
Revolving loans converted to term loans	30	36
Loans	1,773	1,870
Other consumer [Member] | FICO not required [Member] | Non-government insured/guaranteed [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, current fiscal year	0	0
Term loans by origination year, fiscal year before current fiscal year	0	0
Term loans by origination year, two years before current fiscal year	0	0
Term loans by origination year, three years before current fiscal year	0	0
Term loans by origination year, four years before current fiscal year	0	0
Term loans by origination year, more than five years before current fiscal year	0	0
Revolving loans	19,387	18,715
Revolving loans converted to term loans	0	0
Loans	$ 19,387	$ 18,715