Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 24,976	$ 71,770
Greater Than Twelve Months	60,062	11,352
Total	85,038	83,122
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	1,718	10,425
Greater Than Twelve Months	13,097	2,593
Total	$ 14,815	$ 13,018
Total number of fixed maturity AFS securities in an unrealized loss position | security	8,590	8,175
Unrealized holding losses arising during the period	$ 12	$ 6
Corporate Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	19,817	59,929
Greater Than Twelve Months	48,011	7,094
Total	67,828	67,023
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	1,528	9,049
Greater Than Twelve Months	11,235	1,955
Total	12,763	11,004
U.S. Government Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	70	261
Greater Than Twelve Months	222	27
Total	292	288
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	5	25
Greater Than Twelve Months	43	6
Total	48	31
State And Municipal Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	1,357	1,958
Greater Than Twelve Months	1,655	237
Total	3,012	2,195
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	42	440
Greater Than Twelve Months	502	72
Total	544	512
Foreign Government Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	75	130
Greater Than Twelve Months	120	58
Total	195	188
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	6	19
Greater Than Twelve Months	56	28
Total	62	47
RMBS [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	613	1,490
Greater Than Twelve Months	1,119	193
Total	1,732	1,683
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	46	179
Greater Than Twelve Months	230	43
Total	276	222
CMBS [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	608	1,224
Greater Than Twelve Months	1,077	320
Total	1,685	1,544
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	21	156
Greater Than Twelve Months	241	90
Total	262	246
ABS [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	2,376	6,715
Greater Than Twelve Months	7,742	3,326
Total	10,118	10,041
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	67	552
Greater Than Twelve Months	773	374
Total	840	926
Hybrid And Redeemable Preferred Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	60	63
Greater Than Twelve Months	116	97
Total	176	160
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	3	5
Greater Than Twelve Months	17	25
Total	$ 20	$ 30