Shareholders' Equity (Schedule Of Accumulated Other Comprehensive (Loss) Income) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Foreign currency translation	$ (114)	$ 134
Net unrealized losses on hedges of net investments in non-U.S. subsidiaries	(14)	(14)
Net unrealized gains on available-for-sale securities portfolio	849	815
Net unrealized losses related to reclassified available-for-sale securities	(97)	(110)
Net unrealized gains on available-for-sale securities	752	705
Net unrealized losses on available-for-sale securities designated in fair value hedges	(168)	(183)
Other-than-temporary impairment on available-for-sale securities related to factors other than credit	1	(3)
Other-than-temporary impairment on held-to-maturity securities related to factors other than credit	(59)	(65)
Net unrealized gains on cash flow hedges	133	69
Unrealized losses on retirement plans	(280)	(283)
Total	$ 251	$ 360