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
Schedule of Available-for-sale Securities [Line Items]
Total number of fixed maturity AFS securities in an unrealized loss position | security	8,537	8,106
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	$ 24,603	$ 69,198
Greater Than Twelve Months	59,051	11,105
Fair Value - Total	83,654	80,303
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	1,294	10,013
Greater Than Twelve Months	9,831	2,486
Gross Unrealized Losses - Total	11,125	12,499
Unrealized holding gains (losses) arising during the period	11	6
Corporate Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	19,506	57,656
Greater Than Twelve Months	47,089	6,867
Fair Value - Total	66,595	64,523
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	1,136	8,684
Greater Than Twelve Months	8,251	1,854
Gross Unrealized Losses - Total	9,387	10,538
U.S. Government Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	70	236
Greater Than Twelve Months	221	27
Fair Value - Total	291	263
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	42	6
Gross Unrealized Losses - Total	47	31
State And Municipal Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	1,312	1,850
Greater Than Twelve Months	1,607	227
Fair Value - Total	2,919	2,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	27	414
Greater Than Twelve Months	319	69
Gross Unrealized Losses - Total	346	483
Foreign Government Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	71	122
Greater Than Twelve Months	120	58
Fair Value - Total	191	180
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	6	18
Greater Than Twelve Months	55	27
Gross Unrealized Losses - Total	61	45
RMBS [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	602	1,337
Greater Than Twelve Months	1,082	191
Fair Value - Total	1,684	1,528
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	31	160
Greater Than Twelve Months	179	43
Gross Unrealized Losses - Total	210	203
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	312
Fair Value - Total	1,685	1,536
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	18	156
Greater Than Twelve Months	218	88
Gross Unrealized Losses - Total	236	244
ABS [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	2,375	6,712
Greater Than Twelve Months	7,739	3,325
Fair Value - Total	10,114	10,037
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	67	551
Greater Than Twelve Months	753	374
Gross Unrealized Losses - Total	820	925
Hybrid And Redeemable Preferred Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
Less Than or Equal to Twelve Months	59	61
Greater Than Twelve Months	116	98
Fair Value - Total	175	159
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI
Less Than or Equal to Twelve Months	4	5
Greater Than Twelve Months	14	25
Gross Unrealized Losses - Total	$ 18	$ 30