Operating Segment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Financial Information of Operating Segment [Abstract]
Net interest income	$ 10,662,000,000	$ 10,542,000,000	$ 32,587,000,000	$ 31,871,000,000
Provision for credit losses	1,591,000,000	1,811,000,000	5,386,000,000	5,859,000,000
Noninterest income	10,551,000,000	9,086,000,000	31,551,000,000	28,472,000,000
Total noninterest expense	12,112,000,000	11,677,000,000	37,502,000,000	36,885,000,000
Income (loss) before income tax expense (benefit)	7,510,000,000	6,140,000,000	21,250,000,000	17,599,000,000
Income tax expense (benefit)	2,480,000,000	1,998,000,000	7,179,000,000	5,571,000,000
Net income (loss) before noncontrolling interests	5,030,000,000	4,142,000,000	14,071,000,000	12,028,000,000
Less: Net income (loss) from noncontrolling interests	93,000,000	87,000,000	264,000,000	266,000,000
Net income (loss)	4,937,000,000	4,055,000,000	13,807,000,000	11,762,000,000
Average loans	776,700,000,000	754,500,000,000	771,200,000,000	753,300,000,000
Average assets	1,354,300,000,000	1,281,400,000,000	1,326,400,000,000	1,258,000,000,000
Average core deposits	895,400,000,000	836,800,000,000	882,200,000,000	813,900,000,000
Operating Segment (Textual) [Abstract]
Annual sales of wholesale banking businesses			in excess of $20 million
Annual sales of small business community banking customers			up to $20 million
Community Banking [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	7,247,000,000	7,272,000,000	21,879,000,000	22,237,000,000
Provision for credit losses	1,627,000,000	1,974,000,000	5,078,000,000	5,951,000,000
Noninterest income	5,863,000,000	5,238,000,000	17,744,000,000	15,535,000,000
Total noninterest expense	7,402,000,000	6,905,000,000	22,807,000,000	21,939,000,000
Income (loss) before income tax expense (benefit)	4,081,000,000	3,631,000,000	11,738,000,000	9,882,000,000
Income tax expense (benefit)	1,250,000,000	1,220,000,000	3,856,000,000	3,020,000,000
Net income (loss) before noncontrolling interests	2,831,000,000	2,411,000,000	7,882,000,000	6,862,000,000
Less: Net income (loss) from noncontrolling interests	91,000,000	87,000,000	259,000,000	238,000,000
Net income (loss)	2,740,000,000	2,324,000,000	7,623,000,000	6,624,000,000
Average loans	485,300,000,000	489,700,000,000	485,100,000,000	498,300,000,000
Average assets	765,100,000,000	751,800,000,000	750,100,000,000	752,000,000,000
Average core deposits	594,500,000,000	556,400,000,000	585,300,000,000	552,300,000,000
Wholesale Banking [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	3,028,000,000	2,897,000,000	9,556,000,000	8,545,000,000
Provision for credit losses	(57,000,000)	(178,000,000)	226,000,000	(141,000,000)
Noninterest income	2,921,000,000	2,238,000,000	8,543,000,000	7,607,000,000
Total noninterest expense	2,908,000,000	2,689,000,000	9,075,000,000	8,239,000,000
Income (loss) before income tax expense (benefit)	3,098,000,000	2,624,000,000	8,798,000,000	8,054,000,000
Income tax expense (benefit)	1,103,000,000	822,000,000	3,051,000,000	2,682,000,000
Net income (loss) before noncontrolling interests	1,995,000,000	1,802,000,000	5,747,000,000	5,372,000,000
Less: Net income (loss) from noncontrolling interests	2,000,000	(1,000,000)	5,000,000	21,000,000
Net income (loss)	1,993,000,000	1,803,000,000	5,742,000,000	5,351,000,000
Average loans	277,100,000,000	253,400,000,000	272,000,000,000	243,700,000,000
Average assets	490,700,000,000	437,100,000,000	479,000,000,000	417,900,000,000
Average core deposits	225,400,000,000	209,300,000,000	222,400,000,000	195,000,000,000
Wealth Brokerage and Retirement [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	680,000,000	716,000,000	2,079,000,000	2,113,000,000
Provision for credit losses	30,000,000	48,000,000	110,000,000	150,000,000
Noninterest income	2,353,000,000	2,172,000,000	6,987,000,000	7,022,000,000
Total noninterest expense	2,457,000,000	2,371,000,000	7,380,000,000	7,414,000,000
Income (loss) before income tax expense (benefit)	546,000,000	469,000,000	1,576,000,000	1,571,000,000
Income tax expense (benefit)	208,000,000	178,000,000	599,000,000	594,000,000
Net income (loss) before noncontrolling interests	338,000,000	291,000,000	977,000,000	977,000,000
Less: Net income (loss) from noncontrolling interests	0	1,000,000	0	7,000,000
Net income (loss)	338,000,000	290,000,000	977,000,000	970,000,000
Average loans	42,500,000,000	43,100,000,000	42,500,000,000	43,100,000,000
Average assets	163,800,000,000	158,400,000,000	162,200,000,000	153,300,000,000
Average core deposits	136,700,000,000	133,300,000,000	135,500,000,000	128,200,000,000
Other [Member]
Financial Information of Operating Segment [Abstract]
Net interest income	(293,000,000)	(343,000,000)	(927,000,000)	(1,024,000,000)
Provision for credit losses	(9,000,000)	(33,000,000)	(28,000,000)	(101,000,000)
Noninterest income	(586,000,000)	(562,000,000)	(1,723,000,000)	(1,692,000,000)
Total noninterest expense	(655,000,000)	(288,000,000)	(1,760,000,000)	(707,000,000)
Income (loss) before income tax expense (benefit)	(215,000,000)	(584,000,000)	(862,000,000)	(1,908,000,000)
Income tax expense (benefit)	(81,000,000)	(222,000,000)	(327,000,000)	(725,000,000)
Net income (loss) before noncontrolling interests	(134,000,000)	(362,000,000)	(535,000,000)	(1,183,000,000)
Less: Net income (loss) from noncontrolling interests	0	0	0	0
Net income (loss)	(134,000,000)	(362,000,000)	(535,000,000)	(1,183,000,000)
Average loans	(28,200,000,000)	(31,700,000,000)	(28,400,000,000)	(31,800,000,000)
Average assets	(65,300,000,000)	(65,900,000,000)	(64,900,000,000)	(65,200,000,000)
Average core deposits	$ (61,200,000,000)	$ (62,200,000,000)	$ (61,000,000,000)	$ (61,600,000,000)