Variable Interest Entities - Classifications of Consolidated VIE Assets, Liabilities and Noncontrolling Interest Included in the Bancorp's Consolidated Balance Sheets (Details) - USD ($) $ in Millions		Dec. 31, 2020		Jan. 01, 2020	Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Assets
Other short-term investments	[1]	$ 33,399			$ 1,950
ALLL		(2,453)	[1]	$ (653)	(1,202)	[1]	$ (1,103)	$ (1,196)
Other assets	[1]	10,749			9,190
Total Assets		204,680			169,369
Liabilities
Other liabilities	[1]	3,409			2,422
Long-term debt	[1]	14,973			14,970
Total Liabilities		181,569			148,166
Variable Interest Entity, Primary Beneficiary | Automobile loan
Assets
Other short-term investments		55			74
Indirect secured consumer loans		756			1,354
ALLL		(7)			(7)
Other assets		5			8
Total Assets		809			1,429
Liabilities
Other liabilities		2			2
Long-term debt		656			1,253
Total Liabilities		$ 658			$ 1,255

[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.