Contingencies, Commitments and Guarantees (Insolvency Assessments) (Details) $ in Millions	Dec. 31, 2024 USD ($)
Other Assets:
Premium tax offset for future discounted and undiscounted assessments	$ 51
Premium tax offset currently available for paid assessments	85
Other Liabilities:
Insolvency assessments	68
Insurance-related Assessments
Other Assets:
Total assets held for insolvency assessments	$ 136