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Investment Securities (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Available For Sale Securities Debt Maturities Amortized Cost [Abstract]  
Due within 1 year $ 505
Due after 1 year but within 5 years 489
Due after 5 years but within 10 years 215
Due after 10 years 3,647
Total 4,856
Estimated Fair Value  
Estimated Fair Value, Due within 1 year 505
Estimated Fair Value, Due after 1 year but within 5 years 496
Estimated Fair Value, Due after 5 years but within 10 years 224
Estimated Fair Value, Due after 10 years 3,619
Total $ 4,844