Securities - Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 5,658	$ 1,846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	122	44
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	2,911	1,683
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	752	72
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	8,569	3,529
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	873	116
Debt Securities | U.S. Treasury Obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	1,487	45
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	4
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,487	45
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4
Debt Securities | U.S. Government and GSE obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	243	317
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	5	7
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	1,156	185
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	346	8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,399	502
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	351	15
Debt Securities | GSE Certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	871	846
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	46	28
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	420	293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	114	17
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,291	1,139
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	160	45
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	2,219	491
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	36	8
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	925	926
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	264	37
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	3,144	1,417
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	300	45
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	61	130
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	2	1
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	262	135
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	12	2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	323	265
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	14	3
Debt Securities | Municipal Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	9
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	7	8
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	16	8
Debt Securities | Corporate Bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	698
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	27
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	97	99
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	4	1
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	795	99
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	30	1
Debt Securities | Foreign Notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	20	5
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	20	5
Debt Securities | Capital Trust Notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	46
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	2
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	34	37
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	10	7
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	80	37
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	12	7
Equity Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	4	12
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	10
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	14	$ 12
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 2