Derivative Instruments - Schedule of Activity Associated with Derivative Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) policy
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	$ 13,746
Additions	5,637
Maturities/ terminations	(5,692)
Notional amount, ending balance	13,691
Derivatives designated as hedges
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	11,540
Additions	437
Maturities/ terminations	(799)
Notional amount, ending balance	11,178
Derivatives designated as hedges | Cash flow hedges
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	11,540
Additions	437
Maturities/ terminations	(799)
Notional amount, ending balance	11,178
Derivatives designated as hedges | Cash flow hedges | Interest rate swaps
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	8,757
Additions	0
Maturities/ terminations	(699)
Notional amount, ending balance	8,058
Derivatives designated as hedges | Cash flow hedges | Foreign currency swaps
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	144
Additions	12
Maturities/ terminations	0
Notional amount, ending balance	156
Derivatives designated as hedges | Forward bond purchase commitments | Cash flow hedges
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	2,639
Additions	425
Maturities/ terminations	(100)
Notional amount, ending balance	2,964
Derivatives not designated as hedges
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	2,206
Additions	5,200
Maturities/ terminations	(4,893)
Notional amount, ending balance	2,513
Derivatives not designated as hedges | Equity index options
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	604
Additions	490
Maturities/ terminations	(591)
Notional amount, ending balance	503
Derivatives not designated as hedges | Financial futures
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	1,102
Additions	4,189
Maturities/ terminations	(4,302)
Notional amount, ending balance	989
Derivatives not designated as hedges | Foreign currency forward contracts
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	0
Additions	521
Maturities/ terminations	0
Notional amount, ending balance	521
Derivatives not designated as hedges | Forward bond purchase commitments
Derivative, Notional Amount [Roll Forward]
Notional amount, beginning balance	500
Additions	0
Maturities/ terminations	0
Notional amount, ending balance	$ 500
Derivatives not designated as hedges | Fixed indexed annuity embedded derivatives
Number Of Policies [Roll Forward]
Notional amount, beginning balance | policy	4,867
Additions | policy	0
Maturities/ terminations | policy	(696)
Notional amount, ending balance | policy	4,171
Derivatives not designated as hedges | Indexed universal life embedded derivatives
Number Of Policies [Roll Forward]
Notional amount, beginning balance | policy	717
Additions | policy	0
Maturities/ terminations | policy	(29)
Notional amount, ending balance | policy	688