Certain Employee Benefit and Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 mo	Jun. 30, 2011	Jun. 30, 2012 mo	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total compensation expense recognized related to all share-based payment arrangements			$ 56	$ 53
Maximum life of options (in years)	10		10
Shares exercisable at end of period	13,664,000		13,664,000
Weighted average exercisable price of shares exercisable at end of period	$ 97.01		$ 97.01
Treasury stock			1,400,000
Vesting period for restricted stock/unit awards, lower range	36		36
Vesting period for restricted stock/unit awards, upper range	60		60
Unrecognized deferred compensation expense related to nonvested share-based compensation arrangements	115		115
Cash-payable restricted share units outstanding	817,786		817,786
Total noninterest income	$ 1,097	$ 1,452	$ 2,538	$ 2,907