Fair Value Measurement - Carrying Value and Estimated Fair Value (Details 7) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial assets
Cash and due from banks	$ 39,771,000,000	$ 53,723,000,000	$ 59,602,000,000	$ 27,567,000,000
Deposits with banks	316,051,000,000	121,814,000,000
Federal funds sold and securities purchased under resale agreements	248,116,000,000	296,296,000,000
Securities, held-to-maturity	23,731,000,000	8,000,000
Financial liabilities
Commercial Paper	57,848,000,000	55,367,000,000
Other borrowed funds	27,994,000,000	26,636,000,000
Beneficial interest liability, at fair value	49,617,000,000	63,191,000,000
Trading assets and liabilities average balances Abstract
Trading assets - debt and equity instruments	340,449,000,000	349,337,000,000	393,890,000,000
Trading assets - derivative receivables	72,629,000,000	85,744,000,000	90,003,000,000
Trading liabilities - debt and equity instruments	77,706,000,000	69,001,000,000	81,916,000,000
Trading liabilities - derivative payables	64,553,000,000	76,162,000,000	71,539,000,000
Carrying value [Member]
Financial assets
Cash and due from banks	39,800,000,000	53,700,000,000
Deposits with banks	316,100,000,000	121,800,000,000
Accrued interest and accounts receivable	65,200,000,000	60,900,000,000
Federal funds sold and securities purchased under resale agreements	223,000,000,000	272,000,000,000
Securities borrowed	107,700,000,000	108,800,000,000
Securities, held-to-maturity	24,000,000,000	0
Loans, net of allowance for loan losses	720,100,000,000	709,300,000,000
Other assets	58,100,000,000	49,700,000,000
Financial liabilities
Deposits	1,281,100,000,000	1,187,900,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements	175,700,000,000	235,700,000,000
Commercial Paper	57,800,000,000	55,400,000,000
Other borrowed funds	14,700,000,000	15,000,000,000
Accounts payable and other liabilities	160,200,000,000	156,500,000,000
Beneficial interest liability, at fair value	47,600,000,000	62,000,000,000
Long-term debt and junior subordinated deferrable interest debentures	239,000,000,000	218,200,000,000
Wholesale lending related commitments	700,000,000	700,000,000
Estimate of Fair Value
Financial assets
Cash and due from banks	39,800,000,000	53,700,000,000
Deposits with banks	316,100,000,000	121,800,000,000
Accrued interest and accounts receivable	65,200,000,000	60,900,000,000
Federal funds sold and securities purchased under resale agreements	223,000,000,000	272,000,000,000
Securities borrowed	107,700,000,000	108,800,000,000
Securities, held-to-maturity	23,700,000,000	0
Loans, net of allowance for loan losses	720,200,000,000	711,800,000,000
Other assets	58,800,000,000	50,100,000,000
Financial liabilities
Deposits	1,281,500,000,000	1,188,400,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements	175,700,000,000	235,700,000,000
Commercial Paper	57,800,000,000	55,400,000,000
Other borrowed funds	14,700,000,000	15,000,000,000
Accounts payable and other liabilities	160,000,000,000	156,300,000,000
Beneficial interest liability, at fair value	47,500,000,000	62,100,000,000
Long-term debt and junior subordinated deferrable interest debentures	246,800,000,000	225,400,000,000
Wholesale lending related commitments	1,000,000,000	1,900,000,000
Estimate of Fair Value | Estimate of Fair Value, Level 1 Inputs [Member]
Financial assets
Cash and due from banks	39,800,000,000	53,700,000,000
Deposits with banks	309,700,000,000	114,100,000,000
Accrued interest and accounts receivable	0	0
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Securities, held-to-maturity	0	0
Loans, net of allowance for loan losses	0	0
Other assets	0	0
Financial liabilities
Deposits	0	0
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Commercial Paper	0	0
Other borrowed funds	0	0
Accounts payable and other liabilities	0	0
Beneficial interest liability, at fair value	0	0
Long-term debt and junior subordinated deferrable interest debentures	0	0
Wholesale lending related commitments	0	0
Estimate of Fair Value | Estimate of Fair Value, Level 2 Inputs [Member]
Financial assets
Cash and due from banks	0	0
Deposits with banks	6,400,000,000	7,700,000,000
Accrued interest and accounts receivable	64,900,000,000	60,300,000,000
Federal funds sold and securities purchased under resale agreements	223,000,000,000	272,000,000,000
Securities borrowed	107,700,000,000	108,800,000,000
Securities, held-to-maturity	23,700,000,000	0
Loans, net of allowance for loan losses	23,000,000,000	26,400,000,000
Other assets	54,500,000,000	42,700,000,000
Financial liabilities
Deposits	1,280,300,000,000	1,187,200,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements	175,700,000,000	235,700,000,000
Commercial Paper	57,800,000,000	55,400,000,000
Other borrowed funds	14,700,000,000	15,000,000,000
Accounts payable and other liabilities	158,200,000,000	153,800,000,000
Beneficial interest liability, at fair value	44,300,000,000	57,700,000,000
Long-term debt and junior subordinated deferrable interest debentures	240,800,000,000	220,000,000,000
Wholesale lending related commitments	0	0
Estimate of Fair Value | Estimate of Fair Value, Level 3 Inputs [Member]
Financial assets
Cash and due from banks	0	0
Deposits with banks	0	0
Accrued interest and accounts receivable	300,000,000	600,000,000
Federal funds sold and securities purchased under resale agreements	0	0
Securities borrowed	0	0
Securities, held-to-maturity	0	0
Loans, net of allowance for loan losses	697,200,000,000	685,400,000,000
Other assets	4,300,000,000	7,400,000,000
Financial liabilities
Deposits	1,200,000,000	1,200,000,000
Federal funds purchased and securities loaned or sold under repurchase agreements	0	0
Commercial Paper	0	0
Other borrowed funds	0	0
Accounts payable and other liabilities	1,800,000,000	2,500,000,000
Beneficial interest liability, at fair value	3,200,000,000	4,400,000,000
Long-term debt and junior subordinated deferrable interest debentures	6,000,000,000	5,400,000,000
Wholesale lending related commitments	$ 1,000,000,000	$ 1,900,000,000