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]
Carrying value of investments accounted for under the equity method	$ 4,800
Total assets	228,591	$ 226,204
Total liabilities	222,443	220,263
Net income (loss)	256	(1,124)	$ 3,710
Nonconsolidated Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Unfunded commitments	1,300
Total assets	903,800	799,000
Total liabilities	78,500	56,700
Net income (loss)	$ 60,100	$ 24,800	$ (12,800)