Investments (Collectively Significant Equity Method Investments - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 24,900
Unfunded Commitments For Investments Accounted For Under Equity Method	5,800
Total Assets	677,457	$ 687,584
Total Liabilities	649,754	657,331
Net income (loss)	4,444	1,602	$ 5,302
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Schedule of Equity Method Investments [Line Items]
Total Assets	1,300,000	1,200,000
Total Liabilities	154,100	148,000
Net income (loss)	$ 63,700	$ 32,800	$ (11,800)