Investments (AFS Unrealized Losses) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	$ (4)	$ (1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,241	4,516
Debt Securities, Available-for-sale, Unrealized Loss Position	2,992	5,002
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(17)	(28)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	751	486
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(13)	(27)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	28,775	27,519
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	28,478	27,336
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	314	211
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(17)	(28)
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2	3
Debt Securities, Available-for-sale, Unrealized Loss Position	2	10
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	4	14
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	4	14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Excluding Accrued Interest	304	310
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	276	280
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	28	30
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
State or local housing agency obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	147	123
Debt Securities, Available-for-sale, Unrealized Loss Position	255	205
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2)	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	108	82
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	454	370
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	454	369
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2)	(1)
Other Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-Sale, Excluding Accrued Interest	19	19
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	18	18
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Non-mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	149	126
Debt Securities, Available-for-sale, Unrealized Loss Position	257	215
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(2)	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	108	89
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	781	713
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	752	681
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	31	33
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2)	(1)
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,092	4,390
Debt Securities, Available-for-sale, Unrealized Loss Position	2,735	4,787
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(15)	(27)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	643	397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12)	(27)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	27,994	26,806
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	27,726	26,655
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	283	178
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(15)	(27)
Single Family [Member] \| U.S. obligations MBS [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	98	488
Debt Securities, Available-for-sale, Unrealized Loss Position	227	669
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	129	181
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(1)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	6,807	5,707
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	6,759	5,683
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	48	25
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(1)
Single Family [Member] \| Mortgage-backed securities, GSE [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	56	71
Debt Securities, Available-for-sale, Unrealized Loss Position	62	71
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	0	(1)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(1)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	200	217
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	199	217
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(1)
Multifamily [Member] \| Mortgage-backed securities, GSE [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,938	3,831
Debt Securities, Available-for-sale, Unrealized Loss Position	2,446	4,047
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	(15)	(25)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	508	216
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12)	(25)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	20,987	20,882
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss	20,768	20,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	234	152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ (15)	$ (25)

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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