Annual report pursuant to Section 13 and 15(d)

Statutory Capital Requirements and Dividend Restrictions (Details)

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Statutory Capital Requirements and Dividend Restrictions (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statutory Capital Requirements And Dividend Restrictions [Abstract]    
Statutory capital and surplus $ 8,725 $ 7,259
Required minimum aggregate statutory capital and surplus $ 3,407 $ 3,279