Fair Value - Schedule of Estimated Fair Value by Level (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets
Other invested assets	$ 11,130	$ 10,839
Debt:
Short-term borrowings	0	150
Fair Value, Nonrecurring \| Reported Value Measurement
Assets
Other invested assets	809	781
Debt:
Short-term borrowings		150
Notes	31,044	31,896
Options	1,726	1,726
Fair Value, Recurring \| Estimate of Fair Value Measurement
Assets
Other invested assets	787	762
Debt:
Short-term borrowings		150
Notes	29,068	30,207
Options	3,088	3,044
Fair Value, Recurring \| Level I \| Estimate of Fair Value Measurement
Assets
Other invested assets	0	0
Debt:
Short-term borrowings		0
Notes	0	0
Options	0	0
Fair Value, Recurring \| Level II \| Estimate of Fair Value Measurement
Assets
Other invested assets	0	0
Debt:
Short-term borrowings		150
Notes	29,068	30,207
Options	0	0
Fair Value, Recurring \| Level III \| Estimate of Fair Value Measurement
Assets
Other invested assets	787	762
Debt:
Short-term borrowings		0
Notes	0	0
Options	$ 3,088	$ 3,044

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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