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Borrowed Funds (Remaining Maturity) (Details)
$ in Billions
Jun. 30, 2020
USD ($)
Debt Disclosure [Abstract]  
Less than 1 year $ 16.1
1 to 2 years 3.6
2 to 3 years 8.9
3 to 4 years 2.8
4 to 5 years 3.2
Over 5 years $ 12.4