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Equity - Statutory Results (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statutory Accounting Practices [Line Items]      
Statutory Net Income $ 1,700 $ 253 $ 861
Statutory Capital 9,842 9,425  
Group Benefits Insurance Subsidiary      
Statutory Accounting Practices [Line Items]      
Statutory Net Income 390 (1,066) 208
Statutory Capital 2,407 2,029  
Property and Casualty Insurance Subsidiaries      
Statutory Accounting Practices [Line Items]      
Statutory Net Income 1,114 950 304
Statutory Capital 7,435 7,396  
Life and Annuity Run-Off Business      
Statutory Accounting Practices [Line Items]      
Statutory Net Income $ 196 $ 369 $ 349