Condensed Balance Sheet - Parent Company Only (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Investments in subsidiaries:
Goodwill	$ 2,416		$ 2,416		$ 2,417
Other assets	8,358	[1]	8,204	[1]
Total Assets	130,443		121,894		116,967
Liabilities
Other short-term borrowings	1,380		6,280
Accrued expenses and other liabilities	3,487	[1]	2,639	[1]
Long-term debt	9,633	[1]	7,085	[1]
Total liabilities	115,817		108,130
Bancorp Shareholders' Equity	14,589		13,716
Total Liabilities and Equity	130,443		121,894
Parent Company [Member]
Assets
Short-term Investments	2,505		3,481
Loans to subsidiaries:
Nonbank subsidiaries	974		1,021
Total loans to subsidiaries	974		1,021
Investments in subsidiaries:
Nonbank subsidiaries	16,254		15,376
Total investment in subsidiaries	16,254		15,376
Goodwill	80		80
Other assets	323		579
Total Assets	20,136		20,537
Liabilities
Other short-term borrowings	311		566
Accrued expenses and other liabilities	442		456
Long-term debt	4,757		5,751
Total liabilities	5,510		6,773
Bancorp Shareholders' Equity	14,626		13,764
Total Liabilities and Equity	$ 20,136		$ 20,537

[1] At December 31, 2013 and 2012, includes $49 and $0 of cash and due from banks, $48 and $50 of commercial mortgage loans, $ 1,010 and $0 of automobile loans, $(15) and $(5) of ALLL, $13 and $3 of other assets, $1 and $0 of other liabilities, $ 1,048 and $0 of long-term debt from consolidated VIEs that are included in their respective captions. See Note 10.