Summarizes the Bancorp's Recorded Investment in Impaired Loans and Related Allowance by Class (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 3,581	$ 3,505
Recorded Investment	3,056	2,931
Allowance	418	438
Commercial Portfolio Segment | Commercial And Industrial Loans [Member] | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	490	404
Recorded Investment	375	291
Allowance	169	128
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member] | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	49	49
Recorded Investment	36	37
Allowance	5	4
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member] | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	192	386
Recorded Investment	128	202
Allowance	24	40
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	155	240
Recorded Investment	102	150
Allowance	19	31
Commercial Portfolio Segment | Commercial Leases [Member] | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	14	15
Recorded Investment	14	15
Allowance	5	7
Residential Mortgage Loans | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,106	1,126
Recorded Investment	1,055	1,071
Allowance	131	121
Consumer Portfolio Segment | Home Equity | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	399	400
Recorded Investment	395	397
Allowance	46	53
Consumer Portfolio Segment | Automobile Loans | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	37	33
Recorded Investment	37	32
Allowance	5	5
Consumer Portfolio Segment | Credit Card | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	101	100
Recorded Investment	90	100
Allowance	14	18
Consumer Portfolio Segment | Consumer Other Financing Receivable | Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3	78
Recorded Investment	3	78
Allowance		31
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,546	2,831
Recorded Investment	2,235	2,373
Allowance	418	438
Commercial Portfolio Segment | Commercial And Industrial Loans [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	296	194
Recorded Investment	233	153
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	100	113
Recorded Investment	86	99
Commercial Portfolio Segment | Automobile Loans | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	166	126
Recorded Investment	142	108
Commercial Portfolio Segment | Commercial Construction | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	171	24
Recorded Investment	106	8
Commercial Portfolio Segment | Commercial Leases [Member] | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	6	17
Recorded Investment	6	17
Residential Mortgage Loans | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	237	146
Recorded Investment	192	121
Consumer Portfolio Segment | Home Equity | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	54	48
Recorded Investment	51	46
Consumer Portfolio Segment | Automobile Loans | Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance		6
Recorded Investment	5	6
Impaired Financing Receivables With No Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,035	674
Recorded Investment	$ 821	$ 558