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Investment Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investment Securities Disclosure [Abstract]
Gain on derivatives used to hedge purchase of investment securities	$ 73
Gross unrealized loss on debt securities held to maturity	39	1
Gross unrealized loss on debt securities held to maturity in a continuous loss position for less than 12 months - fair value	1,600	73
Gross unrealized loss on debt securities held to maturity in a continuous loss position greater than 12 months - fair value	$ 35	$ 56

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized as held-to-maturity.

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- Definition

This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

- Definition

This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details