Employee Stock-Based Incentives - Compensation Expense (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	$ 1,440	$ 1,810	$ 1,986
Accrual of estimated costs of RSUs and SARs to be granted in future periods to full-career eligible employees	779	735	689
Total noncash compensation expense related to employee stock-based incentive plans	2,219	2,545	2,675
Compensation cost related to unvested awards not charged to net income	$ 848
Weighted average period for cost expected to be amortized into compensation expense	1 year