Summary of Loans Modified in a TDR (Detail) $ in Millions		12 Months Ended
		Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	14,472	11,102	11,291
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 409	$ 548	$ 1,081
Increase (Decrease) to ALLL Upon Modification	[1]	23	27	58
Charge-offs Recognized Upon Modification	[1]	$ 10	$ 8	$ 44
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	77	128	146
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 146	$ 230	$ 604
Increase (Decrease) to ALLL Upon Modification	[1]	7	12	39
Charge-offs Recognized Upon Modification	[1]	$ 3	$ 6	$ 44
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	18	32	65	[3]
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 16	$ 54	$ 19	[3]
Increase (Decrease) to ALLL Upon Modification	[1]	$ (2)	$ (1)	$ (2)	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Non Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	12	28	59
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 7	$ 30	$ 72
Increase (Decrease) to ALLL Upon Modification	[1]	$ (1)	(3)	$ (7)
Charge-offs Recognized Upon Modification	[1]		$ 2
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]			4
Recorded Investment in Loans Modified in a TDR During the Period	[1]			$ 34
Increase (Decrease) to ALLL Upon Modification	[1]			$ (2)
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]			1
Recorded Investment in Loans Modified in a TDR During the Period	[1]			$ 2
Increase (Decrease) to ALLL Upon Modification	[1]			$ (5)
Residential Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	1,089	1,093	1,620
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 155	$ 160	$ 249
Increase (Decrease) to ALLL Upon Modification	[1]	$ 8	$ 8	$ 28
Consumer Portfolio Segment | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	267	284	695
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 16	$ 12	$ 37
Increase (Decrease) to ALLL Upon Modification	[1]	$ (1)		$ (1)
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	440	608	499
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 7	$ 10	$ 14
Increase (Decrease) to ALLL Upon Modification	[1]	$ 1	$ 1	$ 1
Consumer Portfolio Segment | Credit Card
Financing Receivable, Modifications [Line Items]
Number of Loans Modified in a TDR During the Period	[1],[2]	12,569	8,929	8,202
Recorded Investment in Loans Modified in a TDR During the Period	[1]	$ 62	$ 52	$ 50
Increase (Decrease) to ALLL Upon Modification	[1]	11	$ 10	$ 7
Charge-offs Recognized Upon Modification	[1]	$ 7

[1] Excludes all loans and leases held for sale and loans acquired with deteriorated credit quality which were accounted for within a pool.

[2] Represents number of loans post-modification and excludes loans previously modified in a TDR.

[3] Excludes five loans modified in a TDR during the year ended December 31, 2013 associated with a consolidated VIE in which the Bancorp has no continuing credit risk due to the risk being assumed by a third party. The TDR had a recorded investment of $29 at modification, the ALLL increased $7 upon modification and a charge-off of $2 was recognized upon modification.