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Investments (Pledged Investments) (Details) - USD ($)
$ in Billions
Jun. 30, 2019
Dec. 31, 2018
Investments [Abstract]    
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of various counterparties $ 7.0 $ 5.7
Cash and investments at fair value on deposit with, or in trust accounts for the benefit of U.S. state regulatory authorities $ 2.9 $ 2.0