Summary of the Bancorp's Long-Term Borrowings (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	[1]	$ 15,844	$ 14,967
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Long-term debt		2,493	3,434
Parent Company Only
Debt Instrument [Line Items]
Long-term debt		$ 6,474
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	1,000
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		$ 500	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		$ 498	497
Parent Company Only | Senior Debt Obligations | Fixed Rate 2.875 Percent Due 2020
Debt Instrument [Line Items]
Maturity date(s) Start		Jul. 29, 2015
Maturity date(s) End		Jul. 27, 2020
Interest rate		2.88%
Long-term debt		$ 1,099
Parent Company Only | Subordinated debt | Fixed Rate 5.45 Percent Notes Due 2017
Debt Instrument [Line Items]
Maturity date(s) Start	[2]	Dec. 20, 2006
Maturity date(s) End	[2]	Jan. 15, 2017
Interest rate	[2]	5.45%
Long-term debt	[2]	$ 520	539
Parent Company Only | Subordinated debt | Fixed Rate 4.50 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity date(s) Start	[2]	May 23, 2003
Maturity date(s) End	[2]	Jun. 01, 2018
Interest rate	[2]	4.50%
Long-term debt	[2]	$ 532	544
Parent Company Only | Subordinated debt | Fixed Rate 4.30 Notes Due 2024
Debt Instrument [Line Items]
Maturity date(s) Start	[2]	Nov. 18, 2013
Maturity date(s) End	[2]	Jan. 16, 2024
Interest rate	[2]	4.30%
Long-term debt	[2]	$ 748	748
Parent Company Only | Subordinated debt | Fixed Rate 8.25 Percent Notes Due 2038
Debt Instrument [Line Items]
Maturity date(s) Start	[2]	Mar. 04, 2008
Maturity date(s) End	[2]	Mar. 01, 2038
Interest rate	[2]	8.25%
Long-term debt	[2]	$ 1,327	1,317
Parent Company Only | Subordinated debt | Floating Rate 0.99 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	[2],[3]	Dec. 13, 2006
Maturity date(s) End	[2],[3]	Dec. 20, 2016
Variable interest rate	[2],[3]	0.99%
Long-term debt	[2],[3]	$ 250	250
Subsidiaries
Debt Instrument [Line Items]
Long-term debt		$ 9,370
Subsidiaries | Debt Other Variable Percent Due 2016 Through 2039
Debt Instrument [Line Items]
Maturity date(s) Start		Jan. 01, 2016
Maturity date(s) End		Dec. 31, 2039
Long-term debt		$ 144	148
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loans
Debt Instrument [Line Items]
Maturity date(s) Start		Jan. 01, 2016
Maturity date(s) End		Dec. 31, 2022
Long-term debt	[3]	$ 2,493	3,434
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Automobile Loans | Lower limit
Debt Instrument [Line Items]
Interest rate		0.43%
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.15 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start		Nov. 18, 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 | 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		$ 652	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		$ 598	597
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	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	846
Subsidiaries | Senior Debt Obligations | Floating Rate 0.87 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	[3]	Nov. 18, 2013
Maturity date(s) End	[3]	Nov. 18, 2016
Variable interest rate	[3]	0.87%
Long-term debt	[3]	$ 750	750
Subsidiaries | Senior Debt Obligations | Floating Rate 0.82 Percent Notes Due 2016
Debt Instrument [Line Items]
Maturity date(s) Start	[3]	Feb. 28, 2013
Maturity date(s) End	[3]	Feb. 26, 2016
Variable interest rate	[3]	0.82%
Long-term debt	[3]	$ 300	300
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.15 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity date(s) Start		Aug. 17, 2015
Maturity date(s) End		Aug. 20, 2018
Interest rate		2.15%
Long-term debt		$ 998
Subsidiaries | Senior Debt Obligations | Floating Rate 1.28 Percent Notes Due 2018
Debt Instrument [Line Items]
Maturity date(s) Start	[3]	Aug. 17, 2015
Maturity date(s) End	[3]	Aug. 20, 2018
Variable interest rate	[3]	1.28%
Long-term debt	[3]	$ 250
Subsidiaries | Subordinated debt | Fixed Rate 4.75 Percent Bank Notes Due 2015
Debt Instrument [Line Items]
Maturity date(s) Start	[2]	Jan. 31, 2005
Maturity date(s) End	[2]	Feb. 01, 2015
Interest rate	[2]	4.75%
Long-term debt	[2]		502
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035
Debt Instrument [Line Items]
Maturity date(s) Start	[3],[4]	Jun. 28, 2005
Maturity date(s) End	[3],[4]	Dec. 15, 2035
Long-term debt	[3],[4]	$ 52	51
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035 | Lower limit
Debt Instrument [Line Items]
Variable interest rate	[3],[4]	1.93%
Subsidiaries | Junior subordinated debt | Floating Rate 1.66% - 1.93% Debentures Due 2035 | Upper Limit
Debt Instrument [Line Items]
Variable interest rate		2.20%
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2015 Through 2041
Debt Instrument [Line Items]
Long-term debt		$ 37	$ 41
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, 2016
Maturity date(s) End		Dec. 31, 2041
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] Includes $152 and $179 of cash and due from banks, $2,537 and $3,378 of portfolio loans and leases, $(28) and $(22) of ALLL, $20 and $25 of other assets, $3 and $5 of other liabilities and $2,493 and $3,434 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2015 and 2014, respectively. For further information, refer to Note 11.

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

[3] These rates reflect the floating rates as of December 31, 2015.

[4] Under the Basel III Final Rule transition provisions, $13 million qualifies as Tier I capital as of December 31, 2015 while the remaining amount qualifies as Tier II capital. The entire amount qualified as Tier I capital as of December 31, 2014. Refer to Note 28 for further information