Long-Term Debt - Summary of the Bancorp's Long-Term Borrowings (Details) - USD ($) $ in Millions		Dec. 31, 2020	May 05, 2020	Jan. 31, 2020	Dec. 31, 2019	Oct. 28, 2019	Mar. 22, 2019	Jul. 26, 2018	Mar. 14, 2018	Jun. 15, 2017	Jun. 14, 2016	Mar. 15, 2016	Sep. 05, 2014	Nov. 20, 2013	Mar. 07, 2012
Debt Instrument
Long-term debt	[1]	$ 14,973			$ 14,970
Amount Qualifying as Tier Two Capital for Regulatory Capital Purposes
Debt Instrument
Long-term debt		2,800			2,700
Parent Company
Debt Instrument
Long-term debt		$ 7,761			7,513
Parent Company | Senior Notes | Fixed Rate 2.875% Due 2020
Debt Instrument
Interest rate		2.875%
Long-term debt		$ 0			1,099
Parent Company | Senior Notes | Floating Rate 0.70 Percent Notes Due 2021
Debt Instrument
Interest rate		0.70%
Long-term debt		$ 250			250
Parent Company | Senior Notes | Fixed Rate 2.60% Notes Due 2022
Debt Instrument
Interest rate		2.60%								2.60%
Long-term debt		$ 699			699
Parent Company | Senior Notes | Fixed Rate 3.50% Due 2022
Debt Instrument
Interest rate		3.50%													3.50%
Long-term debt		$ 499			499
Parent Company | Senior Notes | Fixed Rate 1.625% Notes Due 2023
Debt Instrument
Interest rate		1.625%	1.625%
Long-term debt		$ 498			0
Parent Company | Senior Notes | Fixed Rate 3.65% Notes Due 2024
Debt Instrument
Interest rate		3.65%
Long-term debt		$ 1,494			1,493
Parent Company | Senior Notes | Fixed Rate 2.375% Notes Due 2025
Debt Instrument
Interest rate		2.375%				2.375%
Long-term debt		$ 747			746
Parent Company | Senior Notes | Fixed Rate 2.55% Notes Due 2027
Debt Instrument
Interest rate		2.55%	2.55%
Long-term debt		$ 746			0
Parent Company | Senior Notes | Fixed Rate 3.95% Notes Due 2028
Debt Instrument
Interest rate		3.95%							3.95%
Long-term debt		$ 647			646
Parent Company | Subordinated Debt | Fixed Rate 4.30% Notes Due 2024
Debt Instrument
Interest rate		4.30%												4.30%
Long-term debt		$ 748			748
Parent Company | Subordinated Debt | Fixed Rate 8.25% Notes Due 2038
Debt Instrument
Interest rate		8.25%
Long-term debt		$ 1,433			1,333
Subsidiaries
Debt Instrument
Long-term debt		7,212
Subsidiaries | FHLB Advances Due 2021 to 2047
Debt Instrument
Long-term debt		$ 67			91
Subsidiaries | FHLB Advances Due 2021 to 2047 | Lower limit
Debt Instrument
Interest rate		0.05%
Subsidiaries | FHLB Advances Due 2021 to 2047 | Upper Limit
Debt Instrument
Interest rate		5.91%
Subsidiaries | Other Debt Due 2021 to 2041
Debt Instrument
Long-term debt		$ 262			153
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed-Rate Notes Due 2022 to 2026 | Automobile Loans
Debt Instrument
Long-term debt		$ 623			1,147
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed-Rate Notes Due 2022 to 2026 | Automobile Loans | Lower limit
Debt Instrument
Interest rate		1.80%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed-Rate Notes Due 2022 to 2026 | Automobile Loans | Upper Limit
Debt Instrument
Interest rate		2.69%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Floating-Rate Notes Due 2022 | Automobile Loans
Debt Instrument
Interest rate		0.33%
Long-term debt		$ 0			42
Subsidiaries | Senior Notes | Fixed Rate 2.20% Notes Due 2020
Debt Instrument
Interest rate		2.20%
Long-term debt		$ 0			$ 752
Subsidiaries | Senior Notes | Floating Rate 2.186% Notes Due 2020
Debt Instrument
Interest rate					2.186%
Long-term debt		$ 0			$ 300
Subsidiaries | Senior Notes | Fixed Rate 2.25% Notes Due 2021
Debt Instrument
Interest rate		2.25%									2.25%
Long-term debt		$ 1,249			1,249
Subsidiaries | Senior Notes | Fixed rate 2.875% Notes due 2021
Debt Instrument
Interest rate		2.875%											2.875%
Long-term debt		$ 849			848
Subsidiaries | Senior Notes | Fixed Rate 3.35% Notes Due 2021
Debt Instrument
Interest rate		3.35%						3.35%
Long-term debt		$ 506			508
Subsidiaries | Senior Notes | Floating Rate 0.655% Notes Due 2021
Debt Instrument
Interest rate		0.655%
Long-term debt		$ 300			299
Subsidiaries | Senior Notes | Floating Rate 0.854% Notes Due 2022
Debt Instrument
Interest rate		0.854%
Long-term debt		$ 300			299
Subsidiaries | Senior Notes | Fixed Rate 1.80% Senior Notes Due 2023
Debt Instrument
Interest rate		1.80%		1.80%
Long-term debt		$ 648			0
Subsidiaries | Senior Notes | Fixed Rate 3.95% Notes Due 2025
Debt Instrument
Interest rate		3.95%						3.95%
Long-term debt		$ 836			797
Subsidiaries | Senior Notes | Fixed Rate 2.25% Notes Due 2027
Debt Instrument
Interest rate		2.25%		2.25%
Long-term debt		$ 598			0
Subsidiaries | Senior Notes | Fixed Rate 4.00% Notes Due 2027
Debt Instrument
Interest rate							4.00%
Subsidiaries | Subordinated Debt | Fixed Rate 3.85% Notes Due 2026
Debt Instrument
Interest rate		3.85%										3.85%
Long-term debt		$ 748			748
Subsidiaries | Subordinated Debt | Fixed Rate 4.00% Notes Due 2027
Debt Instrument
Interest rate		4.00%
Long-term debt		$ 172			171
Subsidiaries | Junior Subordinated Debt | Floating-Rate Debentures Due 2035
Debt Instrument
Long-term debt		$ 54			$ 53
Subsidiaries | Junior Subordinated Debt | Floating-Rate Debentures Due 2035 | Lower limit
Debt Instrument
Interest rate		1.73%
Subsidiaries | Junior Subordinated Debt | Floating-Rate Debentures Due 2035 | Upper Limit
Debt Instrument
Interest rate		1.91%

[1] Includes $55 and $74 of other short-term investments, $756 and $1,354 of portfolio loans and leases, $(7) and $(7) of ALLL, $5 and $8 of other assets, $2 and $2 of other liabilities and $656 and $1,253 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2020 and 2019, respectively. For further information, refer to Note 13.