Condensed Balance Sheet - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Investments in subsidiaries:
Goodwill	$ 2,416		$ 2,417		$ 2,417
Other assets	8,204	[1]	8,863	[1]
Total Assets	121,894		116,967		111,007
Liabilities
Other short-term borrowings	6,280		3,239
Accrued expenses and other liabilities	2,639	[1]	3,270	[1]
Long-term debt	7,085	[1]	9,682	[1]
Total liabilities	108,130		103,716
Bancorp Shareholders' Equity	13,716		13,201
Total Liabilities and Bancorp Shareholders' Equity	121,894		116,967
Parent Company [Member]
Assets
Cash			50
Short-term Investments	3,481		3,588
Loans to subsidiaries:
Nonbank subsidiaries	1,021		1,032
Total loans to subsidiaries	1,021		1,032
Investments in subsidiaries:
Nonbank subsidiaries	15,376		15,631
Total investment in subsidiaries	15,376		15,631
Goodwill	80		80
Other assets	579		731
Total Assets	20,537		21,112
Liabilities
Other short-term borrowings	566		655
Accrued expenses and other liabilities	456		422
Long-term debt	5,751		6,784
Total liabilities	6,773		7,861
Bancorp Shareholders' Equity	13,764		13,251
Total Liabilities and Bancorp Shareholders' Equity	$ 20,537		$ 21,112

[1] At December 31, 2012 and 2011, includes $0 and $30 of cash, $0 and $7 of other short-term investments, $50 and $50 of commercial mortgage loans, $0 and $223 of home equity loans, $0 and $259 of automobile loans, ($5) and ($10) of ALLL, $3 and $4 of other assets, $0 and $4 of other liabilities, $0 and $191 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 10.