Future Contract Benefits - Summary of Changes in Present Values of LFPB (UL and Other) (Details) - UL and Other - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Present Value of Expected Future Policy Benefits
Balance as of beginning-of-year	$ 18,597	$ 16,663
Effect of cumulative changes in discount rate assumptions	(1,273)	(1,273)	$ (1,086)	$ (1,515)
Balance as of beginning-of-year, excluding shadow balance in AOCI	19,683	18,178
Effect of actual variances from expected experience			$ 107	$ 116
Adjusted balance as of beginning-of-year	19,790	18,294
Interest accrual	491	452
Net assessments collected	643	681
Benefit payments	(608)	(532)
Balance as of end-of-year, excluding shadow balance in AOCI	20,316	18,895
Balance as of end-of-period	19,043	17,622
Less: Reinsurance recoverables	12,265	11,269
Net balance as of end-of-period, net of reinsurance	$ 6,778	$ 6,353
Weighted-average duration of future policyholder benefit liability (years)	16 years	16 years
Actual effect on liability, based on mortality	$ 107	$ 116
Effect of actual variances from expected experience, net of reinsurance	$ 38	$ 33