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Parent Company (Long-Term Borrowings) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Long-term Borrowings    
Senior $ 180,835 $ 154,472
Subordinated 10,228 10,303
Total 191,063 164,775
Parent Company    
Long-term Borrowings    
Senior 157,255 140,422
Subordinated 10,228 10,303
Total $ 167,483 $ 150,725