Investments - Fair Value and Gross Unrealized Losses in a Continuous Unrealized Loss Position (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) security	Dec. 31, 2023 USD ($) security
Fair Value
Less Than or Equal to Twelve Months	$ 26,332	$ 16,851
Greater Than Twelve Months	33,191	43,082
Total	59,523	59,933
Gross Unrealized Losses
Less Than or Equal to Twelve Months	3,030	1,999
Greater Than Twelve Months	4,993	4,967
Total	$ 8,023	$ 6,966
Total number of fixed maturity AFS securities in an unrealized loss position | security	7,077	7,167
Unrealized holding losses arising during the period	$ 18	$ 7
Corporate bonds
Fair Value
Less Than or Equal to Twelve Months	21,263	13,439
Greater Than Twelve Months	26,263	33,285
Total	47,526	46,724
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2,618	1,744
Greater Than Twelve Months	4,201	4,013
Total	6,819	5,757
U.S. government bonds
Fair Value
Less Than or Equal to Twelve Months	88	65
Greater Than Twelve Months	198	194
Total	286	259
Gross Unrealized Losses
Less Than or Equal to Twelve Months	5	6
Greater Than Twelve Months	32	22
Total	37	28
State and municipal bonds
Fair Value
Less Than or Equal to Twelve Months	689	371
Greater Than Twelve Months	563	814
Total	1,252	1,185
Gross Unrealized Losses
Less Than or Equal to Twelve Months	118	72
Greater Than Twelve Months	136	158
Total	254	230
Foreign government bonds
Fair Value
Less Than or Equal to Twelve Months	77	108
Greater Than Twelve Months	89	57
Total	166	165
Gross Unrealized Losses
Less Than or Equal to Twelve Months	24	31
Greater Than Twelve Months	30	15
Total	54	46
RMBS
Fair Value
Less Than or Equal to Twelve Months	516	355
Greater Than Twelve Months	744	840
Total	1,260	1,195
Gross Unrealized Losses
Less Than or Equal to Twelve Months	37	20
Greater Than Twelve Months	119	118
Total	156	138
CMBS
Fair Value
Less Than or Equal to Twelve Months	637	583
Greater Than Twelve Months	555	586
Total	1,192	1,169
Gross Unrealized Losses
Less Than or Equal to Twelve Months	68	56
Greater Than Twelve Months	90	125
Total	158	181
ABS
Fair Value
Less Than or Equal to Twelve Months	3,052	1,898
Greater Than Twelve Months	4,679	7,212
Total	7,731	9,110
Gross Unrealized Losses
Less Than or Equal to Twelve Months	158	68
Greater Than Twelve Months	375	503
Total	533	571
Hybrid and redeemable preferred securities
Fair Value
Less Than or Equal to Twelve Months	10	32
Greater Than Twelve Months	100	94
Total	110	126
Gross Unrealized Losses
Less Than or Equal to Twelve Months	2	2
Greater Than Twelve Months	10	13
Total	$ 12	$ 15