v3.25.4
Fair value disclosures - Assets and liabilities measured on a recurring basis at fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Assets and liabilities measured on a recurring basis at fair value    
Debt securities $ 3,549 $ 4,042
Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 3,549 4,042
Equity securities 522 469
Total assets 4,283 4,628
Total liabilities 41 226
Recurring basis | Foreign exchange contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 204 117
Recurring basis | Interest rate contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities (40) (191)
Recurring basis | Commodity contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 8 (2)
Recurring basis | Total return swap contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities (1) (33)
U.S. treasury bonds    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 10 10
U.S. treasury bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 10 10
Other U.S. and non-U.S. government bonds    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 74 68
Other U.S. and non-U.S. government bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 74 68
Corporate bonds and other debt securities    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 2,480 3,170
Corporate bonds and other debt securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 2,480 3,170
Asset-backed securities    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 273 219
Asset-backed securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 273 219
U.S. governmental agency | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 572 443
Residential    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 1 2
Residential | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 1 2
Commercial    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 139 130
Commercial | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 139 130
Large capitalization value | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 283 261
Smaller company growth | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 65 41
REIT | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 174 167
Level 1 | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 10 10
Equity securities 348 302
Total assets 358 312
Total liabilities 0 0
Level 1 | Recurring basis | Foreign exchange contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 1 | Recurring basis | Interest rate contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 1 | Recurring basis | Commodity contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 1 | Recurring basis | Total return swap contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 1 | U.S. treasury bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 10 10
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | Corporate bonds and other debt securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | Asset-backed securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | U.S. governmental agency | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | Residential | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | Commercial | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 1 | Large capitalization value | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 283 261
Level 1 | Smaller company growth | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 65 41
Level 1 | REIT | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 2 | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 3,539 4,032
Equity securities 0 0
Total assets 3,751 4,149
Total liabilities 41 226
Level 2 | Recurring basis | Foreign exchange contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 204 117
Level 2 | Recurring basis | Interest rate contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities (40) (191)
Level 2 | Recurring basis | Commodity contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 8 (2)
Level 2 | Recurring basis | Total return swap contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities (1) (33)
Level 2 | U.S. treasury bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 74 68
Level 2 | Corporate bonds and other debt securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 2,480 3,170
Level 2 | Asset-backed securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 273 219
Level 2 | U.S. governmental agency | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 572 443
Level 2 | Residential | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 1 2
Level 2 | Commercial | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 139 130
Level 2 | Large capitalization value | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 2 | Smaller company growth | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 2 | REIT | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 3 | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Equity securities 0 0
Total assets 0 0
Total liabilities 0 0
Level 3 | Recurring basis | Foreign exchange contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 3 | Recurring basis | Interest rate contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 3 | Recurring basis | Commodity contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 3 | Recurring basis | Total return swap contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Level 3 | U.S. treasury bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Corporate bonds and other debt securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Asset-backed securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | U.S. governmental agency | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Residential | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Commercial | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Level 3 | Large capitalization value | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 3 | Smaller company growth | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Level 3 | REIT | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0 0
Measured at NAV | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Equity securities 174 167
Total assets 174 167
Total liabilities 0 0
Measured at NAV | Recurring basis | Foreign exchange contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Measured at NAV | Recurring basis | Interest rate contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Measured at NAV | Recurring basis | Commodity contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Measured at NAV | Recurring basis | Total return swap contracts    
Assets and liabilities measured on a recurring basis at fair value    
Derivate financial instruments - assets/liabilities 0 0
Measured at NAV | U.S. treasury bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Other U.S. and non-U.S. government bonds | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Corporate bonds and other debt securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Asset-backed securities | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | U.S. governmental agency | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Residential | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Commercial | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Debt securities 0 0
Measured at NAV | Large capitalization value | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0
Measured at NAV | Smaller company growth | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities 0
Measured at NAV | REIT | Recurring basis    
Assets and liabilities measured on a recurring basis at fair value    
Equity securities $ 174 $ 167