Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 3,297		$ 3,565		$ 3,581
Recorded Investment	2,941	[1]	3,013	[2]	3,056	[3]
Allowance	303		352		418
Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,115		1,117		1,035
Recorded Investment	932	[1]	876	[2]	821	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	219		375		296
Recorded Investment	193	[1]	265	[2]	233	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	122		78		100
Recorded Investment	111	[1]	69	[2]	86	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	269		191		166
Recorded Investment	239	[1]	157	[2]	142	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	128		143		171
Recorded Investment	68	[1]	105	[2]	106	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8		2		6
Recorded Investment	8	[1]	2	[2]	6	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	326		276		237
Recorded Investment	272	[1]	228	[2]	192	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	40		48		54
Recorded Investment	38	[1]	46	[2]	51	[3]
Impaired Financing Receivables With No Related Allowance [Member] | Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3		4		5
Recorded Investment	3	[1]	4	[2]	5	[3]
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,182		2,448		2,546
Recorded Investment	2,009	[1]	2,137	[2]	2,235	[3]
Allowance	303		352		418
Impaired Financing Receivables With Related Allowance [Member] | Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	278		330		490
Recorded Investment	229	[1]	246	[2]	375	[3]
Allowance	79		102		169
Impaired Financing Receivables With Related Allowance [Member] | Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	63		66		49
Recorded Investment	53	[1]	52	[2]	36	[3]
Allowance	7		10		5
Impaired Financing Receivables With Related Allowance [Member] | Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	193		203		192
Recorded Investment	152	[1]	147	[2]	128	[3]
Allowance	14		24		24
Impaired Financing Receivables With Related Allowance [Member] | Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	80		213		155
Recorded Investment	55	[1]	120	[2]	102	[3]
Allowance	8		18		19
Impaired Financing Receivables With Related Allowance [Member] | Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance			11		14
Recorded Investment			10	[2]	14	[3]
Allowance			2		5
Impaired Financing Receivables With Related Allowance [Member] | Residential Mortgage Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,052		1,091		1,106
Recorded Investment	1,007	[1]	1,038	[2]	1,055	[3]
Allowance	134		131		131
Impaired Financing Receivables With Related Allowance [Member] | Consumer Portfolio Segment | Home Equity
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	403		401		399
Recorded Investment	400	[1]	397	[2]	395	[3]
Allowance	46		46		46
Impaired Financing Receivables With Related Allowance [Member] | Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	33		37		37
Recorded Investment	33	[1]	37	[2]	37	[3]
Allowance	4		5		5
Impaired Financing Receivables With Related Allowance [Member] | Consumer Portfolio Segment | Credit Card
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	78		94		101
Recorded Investment	78	[1]	88	[2]	90	[3]
Allowance	11		14		14
Impaired Financing Receivables With Related Allowance [Member] | Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2		2		3
Recorded Investment	$ 2	[4]	$ 2	[2]	$ 3	[3]

[1] Includes $442, $1,150 and $491, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $153, $129 and $63, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[2] Includes $390, $1,117 and $495, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $160, $141 and $79, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[3] Includes $347, $1,103, and $500, respectively, of commercial, residential mortgage and consumer TDRs on accrual status; $189, $134 and $81, respectively, of commercial, residential mortgage and consumer TDRs on nonaccrual status.

[4] Other securities consist of FHLB and FRB restricted stock holdings of $497 and $346, respectively, at September 30, 2012, and $497 and $345, respectively, at December 31, 2011 and September 30, 2011, that are carried at cost, and certain mutual fund and equity security holdings.