Investments (Net Investment Income - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Net Investment Income [Line Items]
Net Investment Income	$ 1,258	$ 1,276	$ 2,527	$ 2,499
Trading securities (1)
Net Investment Income [Line Items]
Investment gains (losses) on trading securities still held	(6)	0	1	0
Other limited partnership interests
Net Investment Income [Line Items]
Net Investment Income	$ 63	$ 101	$ 119	$ 194