Fair Value Disclosures (Carrying Amounts and Fair Values of Financial Assets and Liabilities Not Recorded at Fair Value) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Securities held to maturity	$ 8,552
Deposits	108,064		107,213
Long-term debt	23,380		21,730
Fair Value [Member]
Securities held to maturity	8,605	[1]
Loans and leases, net of allowance for loan and lease losses, not recorded at fair value	99,915	[2],[3]	100,360	[2],[3]
Deposits	105,416		104,091
Long-term debt	24,421		22,733
Carrying Amount [Member]
Securities held to maturity	8,552	[1]
Loans and leases, net of allowance for loan and lease losses, not recorded at fair value	100,985	[2],[3]	101,380	[2],[3]
Deposits	108,064		107,213
Long-term debt	$ 23,380		$ 21,730

[1] The carrying value excludes amounts deferred in other comprehensive income resulting from the transfer of securities available for sale to securities held to maturity. Refer to Note 10 for additional disclosures.

[2] Includes loans held for sale carried at the lower of cost or market.

[3] The carrying value is net of the allowance for loan and lease losses.