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Related Party Transactions - Summary of Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
HMUS [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties $ 1,890 $ 6,690
Other short-term affiliate lending [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties 5 60
Affiliated Entity [Member]    
Related Party Transaction [Line Items]    
Loans and leases receivable from related parties $ 1,895 $ 6,750