Investment Securities (Gains and Losses Related to Investment Securities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Gross realized gains from sales of available-for-sale securities	$ 104,000,000		$ 101,000,000		$ 152,000,000
Gross realized losses from sales of available-for-sale securities	(90,000,000)	[1]	(46,000,000)	[1]	(12,000,000)
Gross losses from other-than-temporary impairment	(21,000,000)		(53,000,000)		(123,000,000)
Losses reclassified (from) to other comprehensive income	(2,000,000)		21,000,000		50,000,000
Gains (losses) related to investment securities, net	(9,000,000)		23,000,000		67,000,000
Impairment associated with expected credit losses	(11,000,000)		(16,000,000)		(42,000,000)
Impairment associated with management's intent to sell impaired securities prior to recovery in value	(6,000,000)		0		(8,000,000)
Impairment associated with adverse changes in timing of expected future cash flows	(6,000,000)		(16,000,000)		(23,000,000)
Net impairment losses recognized in consolidated statement of income	(23,000,000)		(32,000,000)		(73,000,000)
Available for sale, amortized cost	99,159,000,000		108,563,000,000
GREECE
Available-For-Sale and Held-To-Maturity-Securities [Line Items]
Available for sale, amortized cost			$ 91,000,000

[1] Amount for the year ended December 31, 2012 represented a pre-tax loss from the sale of all of our Greek investment securities, which had an aggregate carrying value of approximately $91 million.