Derivatives (Credit Risk on Freestanding Derivatives) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	$ 2,240	$ 2,049
Derivative, Collateral, Right to Reclaim Cash	107	125
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	10,208	11,577
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	6,233	6,975
Derivative Asset, Fair Value, Amount Offset Against Collateral	168	175
Derivative Liability, Fair Value, Amount Offset Against Collateral	46	25
Derivative assets	10,035	11,411
Derivative liabilities	6,176	6,975
Derivative, Collateral, Obligation to Return Cash	305	252
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged	0
Collateral Amount Not Provided Due to Downgrade Threshold	15
Exchange Traded [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	107	184
Gross estimated fair value of derivative assets	12	18
Gross estimated fair value of derivative liabilities	27	5
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(4)	(1)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(4)	(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	(11)	(3)
Derivative Asset, Collateral, Obligation to Return Securities, Offset	0	0
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	(12)	(1)
Derivative, Collateral, Obligation to Return Securities	955	1,000
Over the Counter [Member]
Credit Derivatives [Line Items]
Derivative, Collateral, Right to Reclaim Securities	1,200	1,200
Gross estimated fair value of derivative assets	10,067	11,438
Gross estimated fair value of derivative liabilities	6,120	6,628
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(3,880)	(4,579)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(3,880)	(4,579)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(4,050)	(5,432)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	0	0
Derivative Asset, Collateral, Obligation to Return Securities, Offset	(2,006)	(1,322)
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	(2,194)	(2,024)
Derivative, Collateral, Obligation to Return Securities	408	398
Exchange Cleared [Member]
Credit Derivatives [Line Items]
Gross estimated fair value of derivative assets	129	121
Gross estimated fair value of derivative liabilities	86	342
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(8)	(33)
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset	(8)	(33)
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset	(92)	(35)
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset	(78)	(295)
Derivative Asset, Collateral, Obligation to Return Securities, Offset	0	0
Derivative Liability, Collateral, Right to Reclaim Securities, Offset	0	(14)
Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	2,663	2,267
Accrued Liabilities [Member]
Credit Derivatives [Line Items]
Derivative assets	173	166
Derivative liabilities	57	0
Derivatives Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	2,239	2,049
Derivatives Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	2,656	2,267
Derivatives Not Subject to Credit- Contingent Provisions
Credit Derivatives [Line Items]
Estimated fair value of derivatives in a net liability position (1)	1	0
Derivatives Not Subject to Credit- Contingent Provisions | Fixed maturity securities AFS
Credit Derivatives [Line Items]
Estimated fair value of collateral provided:	$ 7	$ 0