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Leases Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 13 $ 36
Short-term lease cost 0 1
Variable lease cost 0 1
Sublease income (1) (4)
Total lease costs included in insurance operating costs and other expenses $ 12 $ 34