Fair Value Measurements - Carrying Values and Estimated Fair Values of our Financial Instruments not Measured at Fair value (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Assets:
Mortgage and other loans receivable	$ 3,737	$ 3,868
Other investments	9,987	9,828
Short-term investments	10,601	14,462
Cash	1,393	1,302	$ 1,406
Other assets	4,724	4,735
Liabilities:
Fortitude Re funds withheld payable	3,215	3,207
Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,596	8,764
Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	157	158
Estimated Fair Value
Assets:
Mortgage and other loans receivable	3,672	3,752
Other investments	551	583
Short-term investments	4,389	4,673
Cash	1,393	1,302
Other assets	13	15
Liabilities:
Fortitude Re funds withheld payable	3,294	3,335
Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,086	8,221
Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	157	158
Carrying Value
Assets:
Mortgage and other loans receivable	3,737	3,868
Other investments	551	583
Short-term investments	4,389	4,673
Cash	1,393	1,302
Other assets	13	15
Liabilities:
Fortitude Re funds withheld payable	3,294	3,335
Carrying Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,596	8,764
Carrying Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	157	158
Level 1 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	0	0
Other investments	0	0
Short-term investments	0	0
Cash	1,393	1,302
Other assets	13	15
Liabilities:
Fortitude Re funds withheld payable	0	0
Level 1 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	0	0
Level 1 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	0	0
Level 2 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	339	339
Other investments	546	578
Short-term investments	4,389	4,673
Cash	0	0
Other assets	0	0
Liabilities:
Fortitude Re funds withheld payable	0	0
Level 2 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	8,085	7,981
Level 2 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	0	0
Level 3 | Estimated Fair Value
Assets:
Mortgage and other loans receivable	3,333	3,413
Other investments	5	5
Short-term investments	0	0
Cash	0	0
Other assets	0	0
Liabilities:
Fortitude Re funds withheld payable	3,294	3,335
Level 3 | Estimated Fair Value | Consolidated Entities, Excluding Consolidated Investments
Liabilities:
Long-term debt	1	240
Level 3 | Estimated Fair Value | Consolidated Investments, Including Variable Interest Entities, Primarily Beneficiary
Liabilities:
Long-term debt	$ 157	$ 158