Summary of the Bancorp's Long-Term Borrowings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$ 14,967	[1]	$ 9,633	[1]
Debt Other Variable Percent Due 2015 Through 2039
Debt Instrument [Line Items]
Long-term debt	148		172
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Long-term debt	3,434		1,048
Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations
Debt Instrument [Line Items]
Long-term debt	3,434		1,048
Parent Company Only
Debt Instrument [Line Items]
Long-term debt	5,394		4,757
Parent Company Only | Senior Debt Obligations | Fixed Rate 3.625 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Jan. 25, 2011
Maturity date(s) End	Jan. 25, 2016
Interest rate	3.625%
Long-term debt	1,000		999
Parent Company Only | Senior Debt Obligations | Fixed Rate 2.30 Percent Notes Due 2019
Debt Instrument [Line Items]
Maturity date(s) Start	Feb. 28, 2014
Maturity date(s) End	Mar. 01, 2019
Interest rate	2.30%
Long-term debt	499
Parent Company Only | Senior Debt Obligations | Fixed Rate 3.50 Percent Due 2022
Debt Instrument [Line Items]
Maturity date(s) Start	Mar. 07, 2012
Maturity date(s) End	Mar. 15, 2022
Interest rate	3.50%
Long-term debt	497		497
Parent Company Only | Subordinated debt | Floating Rate 0.67 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Dec. 13, 2006	[2]
Maturity date(s) End	Dec. 20, 2016	[2]
Variable interest rate	0.67%	[2]
Long-term debt	250	[2]	250	[2]
Parent Company Only | Subordinated debt | Fixed Rate 5.45 Percent Notes Due 2017
Debt Instrument [Line Items]
Maturity date(s) Start	Dec. 20, 2006	[2]
Maturity date(s) End	Jan. 15, 2017	[2]
Interest rate	5.45%	[2]
Long-term debt	539	[2]	558	[2]
Parent Company Only | Subordinated debt | Fixed Rate 4.50 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity date(s) Start	May 23, 2003	[2]
Maturity date(s) End	Jun. 01, 2018	[2]
Interest rate	4.50%	[2]
Long-term debt	544	[2]	555	[2]
Parent Company Only | Subordinated debt | Fixed Rate 4.30 Notes Due 2024
Debt Instrument [Line Items]
Maturity date(s) Start	Nov. 20, 2013	[2]
Maturity date(s) End	Jan. 16, 2024	[2]
Interest rate	4.30%	[2]
Long-term debt	748	[2]	748	[2]
Parent Company Only | Subordinated debt | Fixed Rate 8.25 Percent Notes Due 2038
Debt Instrument [Line Items]
Maturity date(s) Start	Mar. 04, 2008	[2]
Maturity date(s) End	Mar. 01, 2038	[2]
Interest rate	8.25%	[2]
Long-term debt	1,317	[2]	1,150	[2]
Subsidiaries
Debt Instrument [Line Items]
Long-term debt	9,573
Subsidiaries | Debt Other Variable Percent Due 2015 Through 2039
Debt Instrument [Line Items]
Maturity date(s) Start	Jan. 01, 2015
Maturity date(s) End	Dec. 31, 2039
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations
Debt Instrument [Line Items]
Maturity date(s) Start	Jan. 01, 2015
Maturity date(s) End	May 15, 2021
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations | Lower limit
Debt Instrument [Line Items]
Interest rate	0.19%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loan Securitizations | Upper Limit
Debt Instrument [Line Items]
Interest rate	1.47%
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.15 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Nov. 20, 2013
Maturity date(s) End	Nov. 18, 2016
Interest rate	1.15%
Long-term debt	1,000		1,000
Subsidiaries | Senior Debt Obligations | Fixed Rate 0.90 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Feb. 28, 2013
Maturity date(s) End	Feb. 26, 2016
Interest rate	0.90%
Long-term debt	400		400
Subsidiaries | Senior Debt Obligations | Floating Rate 0.74 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Nov. 20, 2013
Maturity date(s) End	Nov. 18, 2016
Variable interest rate	0.74%
Long-term debt	750		750
Subsidiaries | Senior Debt Obligations | Floating Rate 0.64 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	Feb. 28, 2013
Maturity date(s) End	Feb. 26, 2016
Variable interest rate	0.64%
Long-term debt	300		300
Subsidiaries | Senior Debt Obligations | Fixed rate 1.35 percent notes due 2017
Debt Instrument [Line Items]
Maturity date(s) Start	Apr. 25, 2014
Maturity date(s) End	Jun. 01, 2017
Interest rate	1.35%
Long-term debt	654
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.45 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity date(s) Start	Feb. 28, 2013
Maturity date(s) End	Feb. 28, 2018
Interest rate	1.45%
Long-term debt	597		587
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.375 Percent Notes Due 2019
Debt Instrument [Line Items]
Maturity date(s) Start	Apr. 25, 2014
Maturity date(s) End	Apr. 25, 2019
Interest rate	2.375%
Long-term debt	850
Subsidiaries | Senior Debt Obligations | Fixed rate 2.875 percent notes due 2021
Debt Instrument [Line Items]
Maturity date(s) Start	Sep. 05, 2014
Maturity date(s) End	Oct. 01, 2021
Interest rate	2.875%
Long-term debt	846
Subsidiaries | Subordinated debt | Fixed Rate 4.75 Percent Bank Notes Due 2015
Debt Instrument [Line Items]
Maturity date(s) Start	Jan. 31, 2005	[2]
Maturity date(s) End	Feb. 01, 2015	[2]
Interest rate	4.75%	[2]
Long-term debt	502	[2]	524	[2]
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035
Debt Instrument [Line Items]
Maturity date(s) Start	Jun. 28, 2005	[3]
Maturity date(s) End	Dec. 15, 2035	[3]
Long-term debt	51	[3]	51	[3]
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035 | Lower limit
Debt Instrument [Line Items]
Variable interest rate	1.66%	[3]
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035 | Upper Limit
Debt Instrument [Line Items]
Variable interest rate	1.93%	[3]
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2015 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2014 And 2041
Debt Instrument [Line Items]
Maturity date(s) Start	Jan. 01, 2015
Maturity date(s) End	Dec. 31, 2041
Long-term debt	$ 41		$ 44
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2015 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2014 And 2041 | Lower limit
Debt Instrument [Line Items]
Interest rate	0.05%
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2015 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2014 And 2041 | Upper Limit
Debt Instrument [Line Items]
Interest rate	6.87%

[1] At December 31, 2014 and 2013, includes $179 and $49 of cash and due from banks, $47 and $48 of commercial mortgage loans, $3,331 and $1,010 of automobile loans, $(22) and $(15) of ALLL, $25 and $13 of other assets, $5 and $1 of other liabilities, $3,434 and $1,048 of long-term debt from consolidated VIEs that are included in their respective captions. For further information, refer to Note 10.

[2] Qualify as Tier II capital for regulatory capital purposes.

[3] Qualify as Tier I capital for regulatory capital purposes. Refer to Note 28 for further information.