Derivative Instruments (Gains (Losses) On Derivative Instruments Designated As Cash Flow Hedges) (Details) - USD ($) $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gains (losses) on derivative instruments designated and qualifying as cash flow hedges
Offset to net investment income	$ 1,411	$ 1,295	$ 1,398	$ 1,411	$ 1,444	$ 1,575	$ 1,583	$ 1,509					$ 5,515	$ 6,111	$ 5,510
Offset to realized gain (loss)	(407)	212	515	25	514	79	1	(180)	$ 540	$ (179)	$ 752	$ (100)	345	414	(513)
Offset to interest and debt expense	$ (78)	$ (71)	$ (68)	$ (66)	$ (67)	$ (73)	$ (65)	$ (65)					$ (283)	$ (270)	$ (284)