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Investment Securities (Investment Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Available-for-sale Securities [Abstract]
Taxable interest	$ 69	$ 70	$ 132	$ 139
Taxable dividends	7	7	12	12
Interest and dividends on available-for-sale investment securities	$ 76	$ 77	$ 144	$ 151

Interest income on securities classified neither as held-to-maturity nor trading ("available-for-sale securities") includes: (a) interest and dividends earned on all securities and (b) amortization and accretion (as applicable) of discounts and premiums, if any.

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