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SCHEDULE IV - CONSOLIDATED REINSURANCE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consolidated reinsurance, net [Abstract]      
Premiums Earned, Net, Total $ 5,372 $ 5,513 $ 4,601
Reinsurance Related [Member]      
Consolidated reinsurance, net [Abstract]      
Gross Amount 13,304 13,498 12,041
Ceded to Other Companies 1,656 1,579 1,543
Assumed from Other Companies 95 91 89
Premiums Earned, Net, Total 11,743 12,010 10,587
Gross Amount, Life Insurance in Force 1,653,625 1,524,977 1,420,500
Ceded to Other Companies, Life Insurance in Force 674,256 628,654 667,900
Assumed from Other Companies, Life Insurance in Force 7,875 7,611 8,700
Premiums, Net, Life Insurance in Force, Total $ 987,244 $ 903,934 $ 761,300
Percentage of Amount Assumed to Net, Life Insurance in Force 0.80% 0.80% 1.10%
Life Insurance And Annuity Reserves And Claims Due [Member] | Reinsurance Related [Member]      
Consolidated reinsurance, net [Abstract]      
Gross Amount $ 10,474 $ 10,725 $ 9,742
Ceded to Other Companies 1,621 1,545 1,509
Assumed from Other Companies 88 82 81
Premiums Earned, Net, Total $ 8,941 $ 9,262 $ 8,314
Percentage of Amount Assumed to Net 1.00% 0.90% 1.00%
Accident And Health Life Insurance Reserves [Member] | Reinsurance Related [Member]      
Consolidated reinsurance, net [Abstract]      
Gross Amount $ 2,830 $ 2,773 $ 2,299
Ceded to Other Companies 35 34 34
Assumed from Other Companies 7 9 8
Premiums Earned, Net, Total $ 2,802 $ 2,748 $ 2,273
Percentage of Amount Assumed to Net 0.20% 0.30% 0.40%