Fair Value of Financial Instruments (Tables)

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Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2011
Fair Value of Financial Instruments [Abstract]
Carrying and fair values of financial instruments	June 30, 2011   December 31, 2010     Carrying   Fair   Carrying   Fair   (Dollars in millions)   Value   Value   Value   Value   Financial assets                                 Loans   $ 882,653     $ 862,646     $ 876,739     $ 861,695   Financial liabilities                                 Deposits     1,038,408       1,038,436       1,010,430       1,010,460   Long-term debt     426,659       426,645       448,431       441,672