Fair Value, Assets Recorded at Fair Value on Nonrecurring Basis (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	$ 25,175	$ 47,531
Loans held for sale	1,102	873
Loans	0	309
MSRs (carried at fair value)	14,778	14,467
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	0	0
Loans held for sale	0	0
Loans	0	0
MSRs (carried at fair value)	0	0
Other assets	0	0
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	2,029	2,000
Loans held for sale	118	352
Loans	4,724	8,350
MSRs (carried at fair value)	0	0
Other assets	548	765
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,129	2,480
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	3,595	5,870
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	916	891
Loans held for sale	0	0
Loans	39	85
MSRs (carried at fair value)	123	104
Other assets	77	82
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	29	67
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	10	18
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgages held for sale	2,945	2,891
Loans held for sale	118	352
Loans	4,763	8,435
MSRs (carried at fair value)	123	104
Other assets	625	847
Fair Value, Measurements, Nonrecurring [Member] | Total Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	1,158	2,547
Fair Value, Measurements, Nonrecurring [Member] | Total Consumer [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 3,605	$ 5,888