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Investment Securities (Investment Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Available-for-sale Securities [Abstract]
Taxable interest	$ 63	$ 69
Taxable dividends	5	5
Interest and dividends on available-for-sale investment securities	$ 68	$ 74

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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