Loans Held-for-Investment - Loan Quality Indicators (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-investment	$ 14,655	$ 13,408
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1,092	704
2021	670	433
2020	362	496
2019	421	209
2018	173	118
Prior	427	460
Revolving Loans Amortized Cost Basis	640	876
Revolving Loans Converted to Term Loans Amortized Cost Basis	373	72
Total	4,158	3,368	$ 4,109
Total loans held-for-investment	4,181	3,385
Consumer loans | Residential first mortgage loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-investment	2,205	1,536
Consumer loans | Residential first mortgage loans | Debt-to-Value Ratio, Greater Than 90 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2022	12	88
2021	87	74
2020	64	142
2019	122	53
2018	44	16
Prior	27	16
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	356	389
Consumer loans | Residential first mortgage loans | Debt-to-Value Ratio, 71-90
Financing Receivable, Credit Quality Indicator [Line Items]
2022	334	109
2021	100	78
2020	58	58
2019	49	29
2018	18	31
Prior	180	185
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	739	490
Consumer loans | Residential first mortgage loans | Debt-to-Vale Ratio, 55-70
Financing Receivable, Credit Quality Indicator [Line Items]
2022	493	69
2021	74	26
2020	23	27
2019	24	9
2018	9	36
Prior	116	163
Revolving Loans Amortized Cost Basis	3	2
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	742	332
Consumer loans | Residential first mortgage loans | Debt-to-Value Ratio, Less than 55
Financing Receivable, Credit Quality Indicator [Line Items]
2022	58	53
2021	65	23
2020	19	25
2019	22	9
2018	9	31
Prior	85	75
Revolving Loans Amortized Cost Basis	76	80
Revolving Loans Converted to Term Loans Amortized Cost Basis	13	14
Total	347	310
Consumer loans | Residential first mortgage loans | FICO Score, Greater than 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	369	139
2021	177	94
2020	71	107
2019	91	40
2018	30	70
Prior	218	212
Revolving Loans Amortized Cost Basis	47	49
Revolving Loans Converted to Term Loans Amortized Cost Basis	3	5
Total	1,006	716
Consumer loans | Residential first mortgage loans | FICO Score, 700 to 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	510	117
2021	85	58
2020	49	69
2019	58	36
2018	28	36
Prior	129	161
Revolving Loans Amortized Cost Basis	23	22
Revolving Loans Converted to Term Loans Amortized Cost Basis	7	6
Total	889	505
Consumer loans | Residential first mortgage loans | FICO Score, Less than 700
Financing Receivable, Credit Quality Indicator [Line Items]
2022	18	63
2021	64	49
2020	44	76
2019	68	24
2018	22	8
Prior	61	66
Revolving Loans Amortized Cost Basis	9	11
Revolving Loans Converted to Term Loans Amortized Cost Basis	3	3
Total	289	300
Consumer loans | Residential first mortgage loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	897	318
2021	324	197
2020	159	233
2019	191	89
2018	66	108
Prior	369	407
Revolving Loans Amortized Cost Basis	79	82
Revolving Loans Converted to Term Loans Amortized Cost Basis	10	10
Total	2,095	1,444	2,205
Consumer loans | Residential first mortgage loans | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	1	1
2020	0	12
2019	1	3
2018	0	4
Prior	3	11
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	3
Total	5	34	21
Consumer loans | Residential first mortgage loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	1
2021	1	3
2020	5	7
2019	25	8
2018	14	2
Prior	36	21
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	3	1
Total	84	43	25
Consumer loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-investment	645	613
Consumer loans | Home equity | Debt-to-Value Ratio, Greater Than 90 Percent
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1	0
2021	0	0
2020	0	0
2019	0	0
2018	0	1
Prior	5	7
Revolving Loans Amortized Cost Basis	1	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	7	8
Consumer loans | Home equity | Debt-to-Value Ratio, 71-90
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1	3
2021	2	3
2020	2	11
2019	8	4
2018	3	1
Prior	7	6
Revolving Loans Amortized Cost Basis	328	369
Revolving Loans Converted to Term Loans Amortized Cost Basis	40	35
Total	391	432
Consumer loans | Home equity | Debt-to-Value Ratio, Less than or Equal to 70
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1	1
2021	1	1
2020	1	4
2019	3	2
2018	2	1
Prior	3	3
Revolving Loans Amortized Cost Basis	212	141
Revolving Loans Converted to Term Loans Amortized Cost Basis	22	18
Total	245	171
Consumer loans | Home equity | FICO Score, Greater than 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1	2
2021	2	2
2020	1	4
2019	3	2
2018	2	1
Prior	4	4
Revolving Loans Amortized Cost Basis	278	238
Revolving Loans Converted to Term Loans Amortized Cost Basis	15	13
Total	306	266
Consumer loans | Home equity | FICO Score, 700 to 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	2	2
2021	1	1
2020	1	6
2019	5	2
2018	2	1
Prior	6	6
Revolving Loans Amortized Cost Basis	225	210
Revolving Loans Converted to Term Loans Amortized Cost Basis	27	22
Total	269	250
Consumer loans | Home equity | FICO Score, Less than 700
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	1
2020	1	5
2019	3	2
2018	1	1
Prior	5	6
Revolving Loans Amortized Cost Basis	38	62
Revolving Loans Converted to Term Loans Amortized Cost Basis	20	18
Total	68	95
Consumer loans | Home equity | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	3	4
2021	3	4
2020	3	15
2019	11	6
2018	5	3
Prior	13	15
Revolving Loans Amortized Cost Basis	539	508
Revolving Loans Converted to Term Loans Amortized Cost Basis	59	49
Total	636	604	838
Consumer loans | Home equity | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	1
Total	0	1	13
Consumer loans | Home equity | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	2	1
Revolving Loans Amortized Cost Basis	2	2
Revolving Loans Converted to Term Loans Amortized Cost Basis	3	3
Total	7	6	3
Consumer loans | Other consumer | FICO Score, Greater than 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	191	251
2021	341	162
2020	195	142
2019	193	56
2018	88	1
Prior	4	4
Revolving Loans Amortized Cost Basis	17	273
Revolving Loans Converted to Term Loans Amortized Cost Basis	187	3
Total	1,216	892
Consumer loans | Other consumer | FICO Score, 700 to 750
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	128
2021	0	62
2020	0	79
2019	0	39
2018	0	0
Prior	0	1
Revolving Loans Amortized Cost Basis	2	7
Revolving Loans Converted to Term Loans Amortized Cost Basis	91	0
Total	93	316
Consumer loans | Other consumer | FICO Score, Less than 700
Financing Receivable, Credit Quality Indicator [Line Items]
2022	1	2
2021	0	4
2020	0	8
2019	0	8
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1	4
Revolving Loans Converted to Term Loans Amortized Cost Basis	20	2
Total	22	28
Consumer loans | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	192	380
2021	340	227
2020	195	226
2019	191	101
2018	87	1
Prior	4	5
Revolving Loans Amortized Cost Basis	19	284
Revolving Loans Converted to Term Loans Amortized Cost Basis	298	5
Total	1,326	1,229	1,000
Consumer loans | Other consumer | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	1	0
2020	0	1
2019	1	1
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	1	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3	2	1
Consumer loans | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	1
2021	0	1
2020	0	2
2019	1	1
2018	1	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	2	5	3
Consumer loans | Residential first mortgage and home equity
Financing Receivable, Credit Quality Indicator [Line Items]
2022	900	323
2021	329	205
2020	167	267
2019	228	106
2018	85	117
Prior	423	455
Revolving Loans Amortized Cost Basis	620	592
Revolving Loans Converted to Term Loans Amortized Cost Basis	75	67
Total	2,827	2,132
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
2022	4,708	5,755
2021	836	347
2020	291	744
2019	555	383
2018	347	421
Prior	783	444
Revolving Loans Amortized Cost Basis	2,838	1,929
Revolving Loans Converted to Term Loans Amortized Cost Basis	116	0
Total loans held-for-investment	10,474	10,023	12,101
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-investment	3,387	3,223
Commercial loans | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	198	518
2021	566	257
2020	201	558
2019	401	313
2018	286	238
Prior	651	402
Revolving Loans Amortized Cost Basis	867	785
Revolving Loans Converted to Term Loans Amortized Cost Basis	110	0
Total loans held-for-investment	3,280	3,071	2,805
Commercial loans | Commercial real estate | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	2
2021	0	5
2020	7	1
2019	2	13
2018	10	64
Prior	56	35
Revolving Loans Amortized Cost Basis	26	8
Revolving Loans Converted to Term Loans Amortized Cost Basis	6	0
Total loans held-for-investment	107	128	166
Commercial loans | Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	2
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	0	2	53
Commercial loans | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	22
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	0	22	37
Commercial loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans held-for-investment	2,653	1,826
Commercial loans | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	76	257
2021	257	81
2020	73	156
2019	152	30
2018	29	95
Prior	74	7
Revolving Loans Amortized Cost Basis	1,904	1,059
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	2,565	1,685	1,200
Commercial loans | Commercial and industrial | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	4
2021	4	4
2020	10	10
2019	0	9
2018	5	0
Prior	0	0
Revolving Loans Amortized Cost Basis	13	44
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	32	71	106
Commercial loans | Commercial and industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	9	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	9	0	24
Commercial loans | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	17
2019	0	18
2018	17	2
Prior	2	0
Revolving Loans Amortized Cost Basis	28	33
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	47	70	52
Commercial loans | Warehouse loan commitments | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2022	4,204	4,834
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	4,204	4,834	7,398
Commercial loans | Warehouse loan commitments | Watch
Financing Receivable, Credit Quality Indicator [Line Items]
2022	180	140
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	180	140	260
Commercial loans | Warehouse loan commitments | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	0	0	0
Commercial loans | Warehouse loan commitments | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2022	50	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total loans held-for-investment	$ 50	$ 0	$ 0