v3.26.1
Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 107,328 [1] $ 101,769 [2]
Equity Method Investments, Fair Value Disclosure 300 [1] 311 [2]
Funds withheld at interest embedded derivatives (149) [1] (128) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 63 [1] 61 [2]
Real Estate Investments Joint Ventures Fair Value Disclosure [1] 16 0
Cash and cash equivalents 3,035 [1] 2,460 [2]
Short-term investments 274 [1] 255 [2]
Derivative Assets (Liabilities), at Fair Value, Net 179 [1] 185 [2]
Investments, Fair Value Disclosure 194 [1] 202 [2]
Assets, Fair Value Disclosure 111,063 [1] 104,933 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 397 470
Derivative Liability 124 59
Funds Held under Reinsurance Agreements, Liability (6,494) (6,805)
Other liabilities (644) (599)
Financial Liabilities Fair Value Disclosure 917 1,010
Fair Value, Net Asset (Liability) 935 [1] 925
Derivative Asset 2 3
Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 15 [1] 17 [2]
Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 73,228 [1] 69,737 [2]
Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,015 [1] 5,100 [2]
Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,543 [1] 1,569 [2]
Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,281 [1] 7,369 [2]
Assets, Fair Value Disclosure 1,153 1,329
Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,335 [1] 2,162 [2]
US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,562 [1] 3,287 [2]
US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 655 [1] 660 [2]
Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,729 [1] 5,872 [2]
Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,817 [1] 4,701 [2]
KOREA, REPUBLIC OF    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,163 [1] 1,312 [2]
Fair Value Inputs Level 1 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,353 [1] 3,074 [2]
Equity Method Investments, Fair Value Disclosure 209 [1] 213 [2]
Funds withheld at interest embedded derivatives 0 [1] 0 [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 0 [1] 0 [2]
Real Estate Investments Joint Ventures Fair Value Disclosure [1] 0 0
Cash and cash equivalents 2,945 [1] 2,460 [2]
Short-term investments 196 [1] 156 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 5,703 [1] 5,903 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Derivative Liability 0 0
Other liabilities 0 0
Financial Liabilities Fair Value Disclosure 0 0
Derivative Asset 0 0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,353 [1] 3,074 [2]
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | KOREA, REPUBLIC OF    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 2 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 91,241 [1] 84,943 [2]
Equity Method Investments, Fair Value Disclosure 0 [1] 0 [2]
Funds withheld at interest embedded derivatives 0 [1] 0 [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 0 [1] 0 [2]
Real Estate Investments Joint Ventures Fair Value Disclosure [1] 0 0
Cash and cash equivalents 90 [1] 0 [2]
Short-term investments 58 [1] 66 [2]
Derivative Assets (Liabilities), at Fair Value, Net 179 [1] 185 [2]
Investments, Fair Value Disclosure 194 [1] 202 [2]
Assets, Fair Value Disclosure 91,583 [1] 85,211 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Derivative Liability 0 0
Other liabilities (642) (596)
Financial Liabilities Fair Value Disclosure 642 596
Derivative Asset 0 0
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 15 [1] 17 [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 63,154 [1] 59,710 [2]
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,015 [1] 5,100 [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,543 [1] 1,569 [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,802 [1] 3,831 [2]
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,272 [1] 2,099 [2]
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 206 [1] 209 [2]
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 655 [1] 660 [2]
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,614 [1] 5,752 [2]
Fair Value Inputs Level 2 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,817 [1] 4,701 [2]
Fair Value Inputs Level 2 Member | KOREA, REPUBLIC OF    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,163 [1] 1,312 [2]
Fair Value Inputs Level 3 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 13,734 [1] 13,752 [2]
Equity Method Investments, Fair Value Disclosure 91 [1] 98 [2]
Funds withheld at interest embedded derivatives (149) [1] (128) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 63 [1] 61 [2]
Real Estate Investments Joint Ventures Fair Value Disclosure [1] 16 0
Cash and cash equivalents 0 [1] 0 [2]
Short-term investments 20 [1] 33 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 13,777 [1] 13,819 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 397 470
Derivative Liability 124 59
Other liabilities (2) (3)
Financial Liabilities Fair Value Disclosure 275 414
Derivative Asset 2 3
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 10,074 [1] 10,027 [2]
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,479 [1] 3,538 [2]
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 63 [1] 63 [2]
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3 [1] 4 [2]
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 115 [1] 120 [2]
Fair Value Inputs Level 3 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | KOREA, REPUBLIC OF    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 0 [1] $ 0 [2]
[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of March 31, 2026, the fair value of such investments was $935 million.
[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2025, the fair value of such investments was $925 million