Long-Term Debt - Summary of the Bancorp's Long-Term Borrowings (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022	May 05, 2020	Jan. 31, 2020	Oct. 28, 2019	Jan. 25, 2019	Jul. 26, 2018	Mar. 14, 2018	Mar. 15, 2016	Nov. 20, 2013
Debt Instrument
Long-term debt	[1]	$ 16,380	$ 13,714
Amount Qualifying as Tier Two Capital for Regulatory Capital Purposes
Debt Instrument
Long-term debt		1,500	1,900
Parent Company
Debt Instrument
Long-term debt		$ 10,108	9,331
Parent Company | Senior Notes | Fixed Rate 1.625% Notes Due 2023
Debt Instrument
Interest rate (as a percent)		1.625%
Long-term debt		$ 0	500
Parent Company | Senior Notes | Fixed Rate 3.65% Notes Due 2024
Debt Instrument
Interest rate (as a percent)		3.65%					3.65%
Long-term debt		$ 1,500	1,498
Parent Company | Senior Notes | Fixed Rate 2.375%Notes Due 2025
Debt Instrument
Interest rate (as a percent)		2.375%				2.375%
Long-term debt		$ 749	748
Parent Company | Senior Notes | Fixed Rate 2.55% Notes Due 2027
Debt Instrument
Interest rate (as a percent)		2.55%		2.55%
Long-term debt		$ 748	747
Parent Company | Senior Notes | Fixed Rate 1.707% Notes Due 2027
Debt Instrument
Interest rate (as a percent)		1.707%
Long-term debt		$ 461	448
Parent Company | Senior Notes | Fixed rate 3.95% Notes Due 2028
Debt Instrument
Interest rate (as a percent)		3.95%							3.95%
Long-term debt		$ 648	648
Parent Company | Senior Notes | Fixed Rate/Floating Rate 4.055% Notes Due 2028
Debt Instrument
Interest rate (as a percent)		4.055%
Long-term debt		$ 386	381
Parent Company | Senior Notes | Fixed Rate/Floating Rate 6.361% Notes Due 202
Debt Instrument
Interest rate (as a percent)		6.361%
Long-term debt		$ 1,013	1,012
Parent Company | Senior Notes | Fixed Rate/Floating Rate 6.339% Notes Due 2029
Debt Instrument
Interest rate (as a percent)		6.339%
Long-term debt		$ 1,245	0
Parent Company | Senior Notes | Fixed Rate/Floating Rate 4.772% Notes Due 2030
Debt Instrument
Interest rate (as a percent)		4.772%
Long-term debt		$ 944	936
Parent Company | Senior Notes | Fixed Rate/Floating Rate 4.337% Notes Due 2033
Debt Instrument
Interest rate (as a percent)		4.337%
Long-term debt		$ 561	556
Parent Company | Subordinated Debt | Fixed Rate 4.30% Notes Due 2024
Debt Instrument
Interest rate (as a percent)		4.30%									4.30%
Long-term debt		$ 750	749
Parent Company | Subordinated Debt | Fixed Rate 8.25% Notes Due 2038
Debt Instrument
Interest rate (as a percent)		8.25%
Long-term debt		$ 1,103	1,108
Subsidiaries
Debt Instrument
Long-term debt		6,272
Subsidiaries | FHLB Advances Due 2021 to 2047
Debt Instrument
Long-term debt		$ 1,510	21
Subsidiaries | FHLB Advances Due 2021 to 2047 | Weighted-Average
Debt Instrument
Interest rate (as a percent)		5.62%
Subsidiaries | Other Debt Due 2021 to 2041
Debt Instrument
Long-term debt		$ 297	302
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Automobile Loans
Debt Instrument
Long-term debt		$ 1,305	75
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Automobile Loans | Minimum
Debt Instrument
Interest rate (as a percent)		5.52%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Automobile Loans | Maximum
Debt Instrument
Interest rate (as a percent)		5.87%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Solar loan securitizations
Debt Instrument
Long-term debt		$ 35	39
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Solar loan securitizations | Minimum
Debt Instrument
Interest rate (as a percent)		4.05%
Subsidiaries | Variable Interest Entity, Primary Beneficiary | Fixed | Solar loan securitizations | Maximum
Debt Instrument
Interest rate (as a percent)		7.00%
Subsidiaries | Senior Notes | Fixed Rate 1.80% Senior Notes Due 2023
Debt Instrument
Interest rate (as a percent)		1.80%
Long-term debt		$ 0	650
Subsidiaries | Senior Notes | Fixed Rate 3.95% Notes Due 2025
Debt Instrument
Interest rate (as a percent)		3.95%						3.95%
Long-term debt		$ 727	723
Subsidiaries | Senior Notes | Fixed Rate/Floating Rate 5.852% Notes Due 2025
Debt Instrument
Interest rate (as a percent)		5.852%
Long-term debt		$ 996	999
Subsidiaries | Senior Notes | Fixed Rate 2.25% Notes Due 2027
Debt Instrument
Interest rate (as a percent)		2.25%			2.25%
Long-term debt		$ 599	599
Subsidiaries | Subordinated Debt | Fixed Rate 3.85% Notes Due 2026
Debt Instrument
Interest rate (as a percent)		3.85%								3.85%
Long-term debt		$ 749	749
Subsidiaries | Subordinated Debt | Fixed Rate 4.00% Notes Due 2027
Debt Instrument
Interest rate (as a percent)		4.00%
Long-term debt		$ 0	173
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 | Minimum
Debt Instrument
Interest rate (as a percent)		7.07%
Subsidiaries | Junior Subordinated Debt | Floating-Rate Debentures Due 2035 | Maximum
Debt Instrument
Interest rate (as a percent)		7.34%

[1] Includes $55 and $17 of other short-term investments, $1,573 and $185 of portfolio loans and leases, $(28) and $(2) of ALLL, $10 and $2 of other assets, $14 and $9 of other liabilities and $1,409 and $118 of long-term debt from consolidated VIEs that are included in their respective captions above at December 31, 2023 and 2022, respectively. For further information, refer to Note 12.