Derivatives (Credit Risk on Freestanding Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	$ 3,145	$ 3,333
Derivative, Collateral, Right to Reclaim Cash	86	86
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8,750	8,370
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	6,845	7,272
Derivative Asset, Fair Value, Amount Offset Against Collateral	225	53
Derivative Liability, Fair Value, Amount Offset Against Collateral	6	9
Derivative assets	8,602	8,212
Derivative liabilities	6,802	7,259
Derivative, Collateral, Obligation to Return Cash	45	26
Collateral Amount Not Provided Due to Downgrade Threshold	15
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged	0
Exchange Traded [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	188	148
Gross estimated fair value of derivative assets	42	11
Gross estimated fair value of derivative liabilities	14	7
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(10)	(1)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(10)	(1)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	0	0
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(3)	(6)
Derivative Asset, Collateral, Obligation to Return Securities, Offset	0	0
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	(1)	0
Over the Counter [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	1,400	1,200
Gross estimated fair value of derivative assets	8,527	8,224
Gross estimated fair value of derivative liabilities	6,425	6,966
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(3,280)	(3,633)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(3,280)	(3,633)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(2,522)	(2,597)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	0	0
Derivative Asset, Collateral, Obligation to Return Securities, Offset	(2,554)	(1,955)
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	(3,139)	(3,325)
Derivative, Collateral, Obligation to Return Securities	357	410
Exchange Cleared [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	806	835
Gross estimated fair value of derivative assets	181	135
Gross estimated fair value of derivative liabilities	406	299
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(18)	(5)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(18)	(5)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(141)	(126)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(380)	(289)
Derivative Asset, Collateral, Obligation to Return Securities, Offset	0	0
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	(8)	(4)
Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	3,873	3,953
Accrued Liabilities [Member]
Credit Derivatives [Line Items]
Derivative assets	148	158
Derivative liabilities	43	13
Derivatives Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	3,078	3,213
Derivatives Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	3,797	3,829
Derivatives Not Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	67	120
Derivatives Not Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	$ 76	$ 124