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Borrowed Funds (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt
December 31, 2015 - Dollars in millions Carrying ValueStated RateMaturity
FHLB (a) $20,108zero-6.50%2016-2030
Bank notes and senior debt
Bank notes$16,033zero-3.30%2016-2043
Senior debt5,2652.70%-6.70%2016-2022
Total bank notes and senior debt$21,298
Subordinated debt
Junior$205.98%2028
Other8,351.82%-6.88%2016-2025
Total subordinated debt$8,556
(a)FHLB borrowings are generally collateralized by residential mortgage loans, other mortgage-related loans and commercial mortgage-backed securities.