Long-Term Debt (Summary of the Bancorp's Long-Term Borrowings) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Debt Instrument
Long-term debt	[1]	$ 14,388	$ 15,810	[2]
Variable Interest Entity, Primary Beneficiary
Debt Instrument
Long-term debt		1,094	2,487	[3]
Parent Company
Debt Instrument
Long-term debt		$ 5,170
Parent Company | Senior Debt Obligations | Fixed Rate 3.625 Percent Notes Due 2016
Debt Instrument
Interest rate		3.625%
Long-term debt		$ 0	1,000	[4]
Parent Company | Senior Debt Obligations | Fixed Rate 2.30 Percent Notes Due 2019
Debt Instrument
Maturity date(s) Start		Feb. 28, 2014
Maturity date(s) End		Mar. 01, 2019
Interest rate		2.30%
Long-term debt		$ 499	498	[4]
Parent Company | Senior Debt Obligations | Fixed Rate 2.875 Percent Due 2020
Debt Instrument
Maturity date(s) Start		Jul. 27, 2015
Maturity date(s) End		Jul. 27, 2020
Interest rate		2.875%
Long-term debt		$ 1,096	1,094	[4]
Parent Company | Senior Debt Obligations | Fixed Rate 3.50 Percent Due 2022
Debt Instrument
Maturity date(s) Start		Mar. 07, 2012
Maturity date(s) End		Mar. 15, 2022
Interest rate		3.50%
Long-term debt		$ 497	496	[4]
Parent Company | Subordinated Debt | Floating Rate 0.99 Percent Notes Due 2016
Debt Instrument
Maturity date(s) Start	[5],[6]	Dec. 13, 2006
Maturity date(s) End	[5],[6]	Dec. 20, 2016
Variable interest rate	[5],[6]	0.99%
Long-term debt	[5],[6]	$ 0	250	[4]
Parent Company | Subordinated Debt | Fixed Rate 5.45 Percent Notes Due 2017
Debt Instrument
Maturity date(s) Start	[5]	Dec. 20, 2006
Maturity date(s) End	[5]	Jan. 15, 2017
Interest rate	[5]	5.45%
Long-term debt	[5]	$ 501	520	[4]
Parent Company | Subordinated Debt | Fixed Rate 4.50 Percent Notes Due 2018
Debt Instrument
Maturity date(s) Start	[5]	May 23, 2003
Maturity date(s) End	[5]	Jun. 01, 2018
Interest rate	[5]	4.50%
Long-term debt	[5]	$ 519	532	[4]
Parent Company | Subordinated Debt | Fixed Rate 4.30 Notes Due 2024
Debt Instrument
Maturity date(s) Start	[5]	Nov. 20, 2013
Maturity date(s) End	[5]	Jan. 16, 2024
Interest rate	[5]	4.30%
Long-term debt	[5]	$ 746	746	[4]
Parent Company | Subordinated Debt | Fixed Rate 8.25 Percent Notes Due 2038
Debt Instrument
Interest rate	[5]	8.25%
Long-term debt	[5]	$ 1,312	1,320	[4]
Subsidiaries
Debt Instrument
Long-term debt		$ 9,218
Subsidiaries | Debt Other Variable Percent Due 2017 Through 2039
Debt Instrument
Maturity date(s) Start		Jan. 01, 2017
Maturity date(s) End		Dec. 31, 2039
Long-term debt		$ 124	143	[4]
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed Rate | Automobile Loans
Debt Instrument
Maturity date(s) Start		Jan. 01, 2018
Maturity date(s) End		Dec. 31, 2022
Long-term debt		$ 1,061	2,301	[4]
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed Rate | Automobile Loans | Lower limit
Debt Instrument
Interest rate		0.68%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed Rate | Automobile Loans | Upper Limit
Debt Instrument
Interest rate		1.79%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Floating Rate | Automobile Loans
Debt Instrument
Maturity date(s) End	[6]	Dec. 31, 2018
Variable interest rate	[6]	1.25%
Long-term debt	[6]	$ 33	186	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.30 Percent Notes Due 2019
Debt Instrument
Maturity date(s) Start		Mar. 15, 2016
Maturity date(s) End		Mar. 15, 2019
Interest rate		2.30%
Long-term debt		$ 748	0	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.15 Percent Notes Due 2016
Debt Instrument
Maturity date(s) Start		Nov. 20, 2013
Maturity date(s) End		Nov. 18, 2016
Interest rate		1.15%
Long-term debt		$ 0	999	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 0.90 Percent Notes Due 2016
Debt Instrument
Maturity date(s) Start		Feb. 28, 2013
Maturity date(s) End		Feb. 26, 2016
Interest rate		0.90%
Long-term debt		$ 0	400	[4]
Subsidiaries | Senior Debt Obligations | Floating Rate 0.87 Percent Notes Due 2016
Debt Instrument
Maturity date(s) Start	[6]	Nov. 20, 2013
Maturity date(s) End	[6]	Nov. 18, 2016
Variable interest rate	[6]	0.87%
Long-term debt	[6]	$ 0	749	[4]
Subsidiaries | Senior Debt Obligations | Fixed rate 1.35 percent notes due 2017
Debt Instrument
Maturity date(s) Start		Apr. 25, 2014
Maturity date(s) End		Jun. 01, 2017
Interest rate		1.35%
Long-term debt		$ 650	652	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.15 Percent Notes Due 2018
Debt Instrument
Maturity date(s) Start		Aug. 20, 2015
Maturity date(s) End		Aug. 20, 2018
Interest rate		2.15%
Long-term debt		$ 997	996	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.45 Percent Notes Due 2018
Debt Instrument
Maturity date(s) Start		Feb. 28, 2013
Maturity date(s) End		Feb. 28, 2018
Interest rate		1.45%
Long-term debt		$ 598	597	[4]
Subsidiaries | Senior Debt Obligations | Floating Rate 1.82 Percent Notes Due 2018
Debt Instrument
Maturity date(s) Start	[6]	Aug. 20, 2015
Maturity date(s) End	[6]	Aug. 20, 2018
Variable interest rate	[6]	1.82%
Long-term debt	[6]	$ 250	250	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.375 Percent Notes Due 2019
Debt Instrument
Maturity date(s) Start		Apr. 25, 2014
Maturity date(s) End		Apr. 25, 2019
Interest rate		2.375%
Long-term debt		$ 849	848	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 1.625 Percent Notes Due 2019
Debt Instrument
Maturity date(s) Start		Sep. 27, 2016
Maturity date(s) End		Sep. 27, 2019
Interest rate		1.625%
Long-term debt		$ 737	0	[4]
Subsidiaries | Senior Debt Obligations | Floating Rate 1.59 Percent Notes Due 2019
Debt Instrument
Maturity date(s) Start	[6]	Sep. 27, 2016
Maturity date(s) End	[6]	Sep. 27, 2019
Variable interest rate	[6]	1.59%
Long-term debt	[6]	$ 249	0	[4]
Subsidiaries | Senior Debt Obligations | Fixed Rate 2.25 Percent Notes Due 2021
Debt Instrument
Maturity date(s) Start		Jun. 14, 2016
Maturity date(s) End		Jun. 14, 2021
Interest rate		2.25%
Long-term debt		$ 1,246	0	[4]
Subsidiaries | Senior Debt Obligations | Fixed rate 2.875 percent notes due 2021
Debt Instrument
Maturity date(s) Start		Sep. 05, 2014
Maturity date(s) End		Oct. 01, 2021
Interest rate		2.875%
Long-term debt		$ 845	844	[4]
Subsidiaries | Senior Debt Obligations | Floating Rate 0.82 Percent Notes Due 2016
Debt Instrument
Maturity date(s) Start	[6]	Feb. 28, 2013
Maturity date(s) End	[6]	Feb. 26, 2016
Variable interest rate	[6]	0.82%
Long-term debt	[6]	$ 0	300	[4]
Subsidiaries | Subordinated Debt | Fixed Rate 3.85 Percent Notes Due 2026
Debt Instrument
Maturity date(s) Start	[5]	Mar. 15, 2016
Maturity date(s) End	[5]	Mar. 15, 2026
Interest rate	[5]	3.85%
Long-term debt	[5]	$ 746	0	[4]
Subsidiaries | Junior Subordinated Debt | Floating Rate 2.38% - 2.65% Debentures Due 2035 | First Charter Capital Trusts
Debt Instrument
Maturity date(s) Start	[6],[7]	Jun. 28, 2005
Maturity date(s) End	[6],[7]	Dec. 15, 2035
Long-term debt	[6],[7]	$ 52	52	[4]
Subsidiaries | Junior Subordinated Debt | Floating Rate 2.38% - 2.65% Debentures Due 2035 | Lower limit | First Charter Capital Trusts
Debt Instrument
Variable interest rate	[6],[7]	2.38%
Subsidiaries | Junior Subordinated Debt | Floating Rate 2.38% - 2.65% Debentures Due 2035 | Upper Limit | First Charter Capital Trusts
Debt Instrument
Variable interest rate	[6],[7]	2.65%
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2017 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2017 And 2041
Debt Instrument
Maturity date(s) Start		Jan. 01, 2017
Maturity date(s) End		Dec. 31, 2041
Long-term debt		$ 33	$ 37	[4]
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2017 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2017 And 2041 | Lower limit
Debt Instrument
Interest rate		0.05%
Subsidiaries | Federal Home Loan Bank Advances 0.05 To 6.87 Percent Due 2017 Through 2041 | FHLB Rate 0.05 To 6.87 Percent Debentures Due 2017 And 2041 | Upper Limit
Debt Instrument
Interest rate		6.87%

[1] Includes $ 85 and $ 152 of cash and due from banks, $ 1,216 and $ 2,537 of portfolio loans and leases, $ (26) and $ (28) of ALLL, $ 9 and $ 14 of other assets, $ 3 and $ 3 of other liabilities and $ 1,094 and $ 2,487 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2016 and 2015 , respectively. For further information, refer to Note 11.

[2] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Consolidated Balance Sheet was adjusted to reflect the reclassification of $34 of debt issuance costs from other assets to long-term debt. For further inform ation refer to Note 1 .

[3] (a) Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Consolidated Balance Sheet was adjusted to reflect the reclassification of $ 6 of debt issuance costs from other assets to long-term debt. For further information refer to Note 1.

[4] Upon adoption of ASU 2015-03 on January 1, 2016, the December 31, 2015 Consolidated Balance Sheet was adjusted to reflect the reclassification of $ 34 of debt issuance costs from other assets to long-term debt. For furthe r information refer to Note 1.

[5] In aggregate, $ 2.7 billion and $ 2.4 billion qualifies as Tier II capital for regulatory capital purposes as of December, 31 2016 and 2015 , respectively.

[6] These rates reflect the floating rates as of December 31, 2016 .

[7] Under the Basel III Final Rule transition provisions, $ 0 and $ 13 qualified as Tier I capital as of December 31, 2016 and 2015 , respectively, while the remaining amounts as of December 31, 2016 and 2015 qualify as Tier II capital. Refer to Note 28 for further information