Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	$ 1,400	$ 1,300
Other Notes Payable	3,800	$ 3,200
Coinsurance Agreement Ceded Amount Of Counterpartys Inforce Individual Life Insurance Liability	32,000
Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Minimum Estimate	11,000
Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Maximum Estimate	$ 12,000