v3.24.1.u1
Future Policy Benefits - Expected future benefits, expenses, and gross premiums (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Individual Retirement    
Liability for Future Policy Benefit, Activity [Line Items]    
Undiscounted expected future benefits and expense $ 2,156 $ 2,048
Undiscounted expected future gross premiums 0 0
Group Retirement    
Liability for Future Policy Benefit, Activity [Line Items]    
Undiscounted expected future benefits and expense 309 317
Undiscounted expected future gross premiums 0 0
Life Insurance    
Liability for Future Policy Benefit, Activity [Line Items]    
Undiscounted expected future benefits and expense 40,741 39,028
Undiscounted expected future gross premiums 30,656 28,964
Discounted expected future gross premiums (at current discount rate) 20,000  
Institutional Markets    
Liability for Future Policy Benefit, Activity [Line Items]    
Undiscounted expected future benefits and expense 42,519 29,029
Undiscounted expected future gross premiums 0 0
Corporate and Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Undiscounted expected future benefits and expense 42,701 44,148
Undiscounted expected future gross premiums 2,106 $ 2,225
Discounted expected future gross premiums (at current discount rate) $ 1,400