Summary of the Bancorp's Long-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 7,085	[1]	$ 9,682	[1]
Parent company
Debt Instrument [Line Items]
Long-term debt	5,751		6,784
Parent company | Senior Debt Obligations | Fixed Rate 6.25 Percent Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Interest rate	6.25%
Long-term debt	758		779
Parent company | Senior Debt Obligations | Fixed Rate 3.625 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity	2016
Interest rate	3.625%
Long-term debt	999		1,000
Parent company | Senior Debt Obligations | Fixed Rate 3.50 Percent Due 2022
Debt Instrument [Line Items]
Maturity	2022
Interest rate	3.50%
Long-term debt	497
Parent company | Subordinated Debt [Member] | Floating Rate 0.98 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity	2016
Variable interest rate	0.73%
Long-term debt	250		250
Parent company | Subordinated Debt [Member] | Fixed Rate 5.45 Percent Notes Due 2017
Debt Instrument [Line Items]
Maturity	2017
Interest rate	5.45%
Long-term debt	583		589
Parent company | Subordinated Debt [Member] | Fixed Rate 4.50 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity	2018
Interest rate	4.50%
Long-term debt	584		581
Parent company | Subordinated Debt [Member] | Fixed Rate 8.25 Percent Notes Due 2038
Debt Instrument [Line Items]
Maturity	2038
Interest rate	8.25%
Long-term debt	1,330		1,348
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 6.50 Percent Notes Due 2067
Debt Instrument [Line Items]
Maturity	2067
Interest rate	6.50%
Long-term debt	750		750
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 7.25 Percent Notes Due 2067 | Group 1 [Member]
Debt Instrument [Line Items]
Long-term debt			594
Parent company | Junior Subordinated Debt [Member] | Fixed Rate 7.25 Percent Notes Due 2067 | Group 2 [Member]
Debt Instrument [Line Items]
Long-term debt			894
Parent company | Structured Repurchase Agreements [Member] | Floating Rate 2.49 Percent Notes Due 2013
Debt Instrument [Line Items]
Long-term debt			250
Parent company | Structured Repurchase Agreements [Member] | Floating Rate 2.54 Percent Notes Due 2013
Debt Instrument [Line Items]
Long-term debt			125
Subsidiaries [Member] | Senior Debt Obligations | Floating Rate Bank Notes Due 2013
Debt Instrument [Line Items]
Maturity	2013
Variable interest rate	0.42%
Long-term debt	500		500
Subsidiaries [Member] | Subordinated Debt [Member] | Fixed Rate 4.75 Percent Bank Notes Due 2015
Debt Instrument [Line Items]
Maturity	2015
Interest rate	4.75%
Long-term debt	546		561
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate Debentures Due 2035
Debt Instrument [Line Items]
Maturity	2035
Long-term debt	50		62
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate Debentures Due 2035 | Lower Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	1.73%
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Floating Rate Debentures Due 2035 | Upper Limit [Member]
Debt Instrument [Line Items]
Variable interest rate	2.00%
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Debt Other Variable Percent Due 2013 Through 2039 | Lower Limit [Member]
Debt Instrument [Line Items]
Maturity	2013
Subsidiaries [Member] | Junior Subordinated Debt [Member] | Debt Other Variable Percent Due 2013 Through 2039 | Upper Limit [Member]
Debt Instrument [Line Items]
Maturity	2039
Subsidiaries [Member] | Federal Home Loan Bank Advances 0.05 To 8.34 Percent Due 2014 Through 2037 | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2014 And 2041
Debt Instrument [Line Items]
Long-term debt	53		1,055
Subsidiaries [Member] | Federal Home Loan Bank Advances 0.05 To 8.34 Percent Due 2014 Through 2037 | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2014 And 2041 | Lower Limit [Member]
Debt Instrument [Line Items]
Maturity	2014
Variable interest rate	0.05%
Subsidiaries [Member] | Federal Home Loan Bank Advances 0.05 To 8.34 Percent Due 2014 Through 2037 | FHLB Rate 0.05 To 8.34 Percent Debentures Due 2014 And 2041 | Upper Limit [Member]
Debt Instrument [Line Items]
Maturity	2041
Variable interest rate	8.34%
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Fixed Rate 4.81 Percent Bank Notes Due 2013
Debt Instrument [Line Items]
Long-term debt			2
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.81 To 2.25 Percent Debentures Due 2013 And 2015
Debt Instrument [Line Items]
Long-term debt			169
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Floating Rate 0.50 Percent Bank Notes Due 2023
Debt Instrument [Line Items]
Long-term debt			22
Subsidiaries [Member] | Variable Interest Entity, Primary Beneficiary | Debt Other Variable Percent Due 2013 Through 2039
Debt Instrument [Line Items]
Long-term debt	$ 185		$ 151

[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.