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Fair Value Disclosures - Assets And Liabilities Measured On A Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	$ 3,316	$ 4,042
Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	3,316	4,042
Equity securities	474	469
Total Assets	3,902	4,628
Total liabilities	127	226
Recurring basis | Foreign exchange contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	109	117
Recurring basis | Commodity contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	3	(2)
Recurring basis | Interest rate contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	(101)	(191)
Recurring basis | Total return swap contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	(26)	(33)
U.S. treasury bonds
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	9	10
U.S. treasury bonds | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	9	10
Other U.S. and non-U.S. government bonds
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	68	68
Other U.S. and non-U.S. government bonds | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	68	68
Corporate bonds and other debt securities
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2,423	3,170
Corporate bonds and other debt securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2,423	3,170
Asset-backed securities
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	222	219
Asset-backed securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	222	219
U.S. governmental agency | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	465	443
Residential
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2	2
Residential | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2	2
Commercial
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	127	130
Commercial | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	127	130
Large capitalization value | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	267	261
Smaller company growth | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	39	41
REIT | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	168	167
Level 1 | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	9	10
Equity securities	306	302
Total Assets	315	312
Total liabilities	0	0
Level 1 | Recurring basis | Foreign exchange contracts
Assets and liabilities measured on a recurring and non-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 and non-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 and non-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 and non-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 and non-recurring basis at fair value
Debt securities	9	10
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis
Assets and liabilities measured on a recurring and non-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 and non-recurring basis at fair value
Debt securities	0	0
Level 1 | Asset-backed securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 1 | U.S. governmental agency | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 1 | Residential | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 1 | Commercial | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 1 | Large capitalization value | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	267	261
Level 1 | Smaller company growth | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	39	41
Level 1 | REIT | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 2 | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	3,307	4,032
Equity securities	0	0
Total Assets	3,419	4,149
Total liabilities	127	226
Level 2 | Recurring basis | Foreign exchange contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	109	117
Level 2 | Recurring basis | Commodity contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	3	(2)
Level 2 | Recurring basis | Interest rate contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	(101)	(191)
Level 2 | Recurring basis | Total return swap contracts
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	(26)	(33)
Level 2 | U.S. treasury bonds | Recurring basis
Assets and liabilities measured on a recurring and non-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 and non-recurring basis at fair value
Debt securities	68	68
Level 2 | Corporate bonds and other debt securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2,423	3,170
Level 2 | Asset-backed securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	222	219
Level 2 | U.S. governmental agency | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	465	443
Level 2 | Residential | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	2	2
Level 2 | Commercial | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	127	130
Level 2 | Large capitalization value | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 2 | Smaller company growth | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 2 | REIT | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 3 | Recurring basis
Assets and liabilities measured on a recurring and non-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 and non-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 and non-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 and non-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 and non-recurring basis at fair value
Derivate financial instruments - assets/liabilities	0	0
Level 3 | Nonrecurring basis | Financial Products
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Loans carried at fair value	70	59
Level 3 | U.S. treasury bonds | Recurring basis
Assets and liabilities measured on a recurring and non-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 and non-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 and non-recurring basis at fair value
Debt securities	0	0
Level 3 | Asset-backed securities | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 3 | U.S. governmental agency | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 3 | Residential | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 3 | Commercial | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Level 3 | Large capitalization value | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 3 | Smaller company growth | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Level 3 | REIT | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Measured at NAV | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Equity securities	168	167
Total Assets	168	167
Total liabilities	0	0
Measured at NAV | Recurring basis | Foreign exchange contracts
Assets and liabilities measured on a recurring and non-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 and non-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 and non-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 and non-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 and non-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 and non-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 and non-recurring basis at fair value
Debt securities	0	0
Measured at NAV | Asset-backed securities | Recurring basis
Assets and liabilities measured on a recurring and non-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 and non-recurring basis at fair value
Debt securities	0	0
Measured at NAV | Residential | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Measured at NAV | Commercial | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Debt securities	0	0
Measured at NAV | Large capitalization value | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Measured at NAV | Smaller company growth | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	0	0
Measured at NAV | REIT | Recurring basis
Assets and liabilities measured on a recurring and non-recurring basis at fair value
Equity securities	$ 168	$ 167

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