Employee Stock Based Incentives - Supplemental Information (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 1,000,000,000	$ 1,000,000,000	$ 1,300,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total fair value of RSUs that vested	2,800,000,000	5,400,000,000	2,300,000,000
Noncash compensation expense related to employee stock-based incentive plans
Cost of prior grants of restricted stock units ("RSUs") and stock appreciation rights ("SARs") that are amortized over their applicable vesting periods	1,810,000,000	1,986,000,000	2,479,000,000
Accrual of estimated costs of RSUs and SARs to be granted in future periods to full-career eligible employees	735,000,000	689,000,000	772,000,000
Total noncash compensation expense related to employee stock-based incentive plans	2,545,000,000	2,675,000,000	3,251,000,000
Compensation cost related to unvested awards not charged to net income	909,000,000
Weighted average period for cost expected to be amortized into compensation expense	10 months 24 days
Assumptions used to value employee stock options and Stock Appreciation Rights (SARs)
Risk-free interest rate	1.19%	2.58%	3.89%
Expected dividend yield	3.15%	2.20%	3.13%
Expected common stock price volatility	35.00%	34.00%	37.00%
Expected life	6 years 7 months 6 days	6 years 6 months	6 years 4 months 24 days
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total intrinsic value of options exercised	283,000,000	191,000,000	154,000,000
Cash received from the exercise of stock options under all stock-based incentive arrangements, and the actual income tax benefit realized related to tax deductions from the exercise of the stock options
Cash received from options exercised	333,000,000	354,000,000	205,000,000
Tax benefit realized	53,000,000	31,000,000	14,000,000
Restricted Stock Units (RSUs) [Member]
RSU activity
RSU activity, Number of shares, Outstanding, January 1	166,631,000
RSU activity, Number of shares, Granted	59,646,000
RSU activity, Number of shares, Vested	(79,062,000)
RSU activity, Number of shares, Forfeited	(5,209,000)
RSU activity, Number of shares, Outstanding, December 31	142,006,000
RSU's weighted-average grant date fair value
RSU activity, Weighted-average grant date fair value, Outstanding, January 1	$ 37.65
RSU activity, Weighted-average grant date fair value, Granted	$ 35.73
RSU activity, Weighted-average grant date fair value, Vested	$ 30.91
RSU activity, Weighted-average grant date fair value, Forfeited	$ 40.22
RSU activity, Weighted-average grant date fair value, Outstanding, December 31	$ 40.49
Employee Stock Options and SARs [Member]
Employee stock option and SARs activity
Employee stock option and SARs activity, Number of options/SARs, Outstanding, January 1	155,761,000
Employee stock option and SARs activity, Number of options/SARs, Granted	14,738,000
Employee stock option and SARs activity, Number of options/SARs, Exercised	(18,675,000)
Employee stock option and SARs activity, Number of options/SARs, Forfeited	(3,888,000)
Employee stock option and SARs activity, Number of options/SARs, Canceled	(32,030,000)
Employee stock option and SARs activity, Number of options/SARs, Outstanding, December 31	115,906,000	155,761,000
Employee stock option and SARs activity, Number of options/SARs, Exercisable, December 31	70,576,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Employee stock option and SARs activity, Weighted-average exercise price, Outstanding, January 1	$ 40.58
Employee stock option and SARs activity, Weighted-average exercise price, Granted	$ 35.70
Employee stock option and SARs activity, Weighted-average exercise price, Exercised	$ 26.45
Employee stock option and SARs activity, Weighted-average exercise price, Forfeited	$ 38.07
Employee stock option and SARs activity, Weighted-average exercise price, Canceled	$ 40.10
Employee stock option and SARs activity, Weighted-average exercise price, Outstanding, December 31	$ 42.44	$ 40.58
Employee stock option and SARs activity, Weighted-average exercise price, Exercisable, December 31	$ 45.87
Employee stock option and SARs activity, Weighted-average remaining contractual life (in years), Outstanding, December 31	5 years 6 months
Employee stock option and SARs activity, Weighted-average remaining contractual life (in years), Exercisable, December 31	4 years 2 months 12 days
Employee stock option and SARs activity, Aggregate intrinsic value, Outstanding, December 31	721,059,000
Employee stock option and SARs activity, Aggregate intrinsic value, Exercisable, December 31	$ 420,713,000
Weighted average grant date per share of stock options and SARs granted	$ 8.89	$ 13.04	$ 12.27
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Assumptions used to value employee stock options and Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period	10 years
Chief Executive Officer [Member] | Stock Appreciation Rights (SARs) [Member]
Assumptions used to value employee stock options and Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period	10 years
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance	2,000,000
First Fifty Percent [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
Second Fifty Percent [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years