Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fixed maturity securities:
Fixed maturity securities	$ 37,251	$ 44,380
Equity securities:
Equity securities	891	1,035
Short term and other	929	1,872
Total assets	39,071	47,287
Other liabilities	(1)	12
Total liabilities	(1)	12
Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	21,537	24,852
States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	8,423	11,943
Asset-backed
Fixed maturity securities:
Fixed maturity securities	7,291	7,585
Common Stock
Equity securities:
Equity securities	210	233
Non-redeemable preferred stock
Equity securities:
Equity securities	681	802
Level 1
Fixed maturity securities:
Fixed maturity securities	118	140
Equity securities:
Equity securities	236	285
Short term and other	895	1,798
Total assets	1,249	2,223
Other liabilities	0	0
Total liabilities	0	0
Level 1 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	118	140
Level 1 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	0	0
Level 1 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	0	0
Level 1 | Common Stock
Equity securities:
Equity securities	180	220
Level 1 | Non-redeemable preferred stock
Equity securities:
Equity securities	56	65
Level 2
Fixed maturity securities:
Fixed maturity securities	35,573	42,691
Equity securities:
Equity securities	625	721
Short term and other	34	74
Total assets	36,232	43,486
Other liabilities	(1)	12
Total liabilities	(1)	12
Level 2 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	20,617	23,775
Level 2 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	8,381	11,887
Level 2 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	6,575	7,029
Level 2 | Common Stock
Equity securities:
Equity securities	0	0
Level 2 | Non-redeemable preferred stock
Equity securities:
Equity securities	625	721
Level 3
Fixed maturity securities:
Fixed maturity securities	1,560	1,549
Equity securities:
Equity securities	30	29
Short term and other	0	0
Total assets	1,590	1,578
Other liabilities	0	0
Total liabilities	0	0
Level 3 | Corporate and other bonds
Fixed maturity securities:
Fixed maturity securities	802	937
Level 3 | States, municipalities and political subdivisions
Fixed maturity securities:
Fixed maturity securities	42	56
Level 3 | Asset-backed
Fixed maturity securities:
Fixed maturity securities	716	556
Level 3 | Common Stock
Equity securities:
Equity securities	30	13
Level 3 | Non-redeemable preferred stock
Equity securities:
Equity securities	$ 0	$ 16