Basis of Presentation - Line of Business Financial Performance (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Income Statement
Securities gains (losses), net	$ 6	$ (19)	$ 11	$ (19)
Other intangibles	55	70	112	141
Total noninterest expense	2,557	2,601	5,027	5,161
Provision for credit losses	362	470	765	951
Net income	1,444	1,378	2,831	2,683
Net (income) loss attributable to noncontrolling interests	40	37	81	70
Net income attributable to U.S. Bancorp	1,484	1,415	2,912	2,753
Wholesale Banking and Commercial Real Estate [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	519	521	1,030	1,056
Net interest income (taxable-equivalent basis), Percent change	(0.40%)		(2.50%)
Noninterest income	273	320	552	631
Noninterest income, Percent change	(14.70%)		(12.50%)
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	792	841	1,582	1,687
Total net revenue, Percent change	(5.80%)		(6.20%)
Noninterest expense	313	321	630	640
Noninterest expense, Percent change	(2.50%)		(1.60%)
Other intangibles	2	4	4	8
Other intangibles, Percent change	(50.00%)		(50.00%)
Total noninterest expense	315	325	634	648
Total noninterest expense, Percent change	(3.10%)		(2.20%)
Income before provision and income taxes	477	516	948	1,039
Income before provision and income taxes, Percent change	(7.60%)		(8.80%)
Provision for credit losses	(30)		(75)	3
Provision for credit losses, Percent change
Income before income taxes	507	516	1,023	1,036
Income before income taxes, Percent change	(1.70%)		(1.30%)
Income taxes and taxable-equivalent adjustment	184	188	372	377
Income taxes and taxable-equivalent adjustment, Percent change	(2.10%)		(1.30%)
Net income	323	328	651	659
Net income, Percent change	(1.50%)		(1.20%)
Net (income) loss attributable to noncontrolling interests
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp	323	328	651	659
Net income attributable to U.S. Bancorp, Percent change	(1.50%)		(1.20%)
Average Balance Sheet
Commercial	50,332	44,479	49,781	43,365
Commercial, Percent change	13.20%		14.80%
Commercial real estate	20,366	19,720	20,133	19,570
Commercial real estate, Percent change	3.30%		2.90%
Residential mortgages	29	63	29	64
Residential mortgages, Percent change	(54.00%)		(54.70%)
Credit card
Credit card, Percent change
Other retail	7	4	10	4
Other retail, Percent change	75.00%
Total loans, excluding covered loans	70,734	64,266	69,953	63,003
Total loans, excluding covered loans, Percent change	10.10%		11.00%
Covered loans	371	1,077	415	1,103
Covered loans, Percent change	(65.60%)		(62.40%)
Total loans	71,105	65,343	70,368	64,106
Total loans, Percent change	8.80%		9.80%
Goodwill	1,604	1,604	1,604	1,604
Goodwill, Percent change
Other intangible assets	26	38	27	40
Other intangible assets, Percent change	(31.60%)		(32.50%)
Assets	77,914	71,380	76,813	69,908
Assets, Percent change	9.20%		9.90%
Noninterest-bearing deposits	30,202	30,557	30,052	30,470
Noninterest-bearing deposits, Percent change	(1.20%)		(1.40%)
Interest checking	10,202	10,824	10,524	11,950
Interest checking, Percent change	(5.70%)		(11.90%)
Savings products	12,938	7,508	12,400	8,193
Savings products, Percent change	72.30%		51.30%
Time deposits	16,415	17,032	16,428	15,193
Time deposits, Percent change	(3.60%)		8.10%
Total deposits	69,757	65,921	69,404	65,806
Total deposits, Percent change	5.80%		5.50%
Total U.S. Bancorp shareholders' equity	7,346	6,333	7,279	6,298
Total U.S. Bancorp shareholders' equity, Percent change	16.00%		15.60%
Consumer and Small Business Banking [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	1,132	1,180	2,284	2,361
Net interest income (taxable-equivalent basis), Percent change	(4.10%)		(3.30%)
Noninterest income	776	905	1,559	1,770
Noninterest income, Percent change	(14.30%)		(11.90%)
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	1,908	2,085	3,843	4,131
Total net revenue, Percent change	(8.50%)		(7.00%)
Noninterest expense	1,182	1,210	2,372	2,391
Noninterest expense, Percent change	(2.30%)		(0.80%)
Other intangibles	10	13	21	26
Other intangibles, Percent change	(23.10%)		(19.20%)
Total noninterest expense	1,192	1,223	2,393	2,417
Total noninterest expense, Percent change	(2.50%)		(1.00%)
Income before provision and income taxes	716	862	1,450	1,714
Income before provision and income taxes, Percent change	(16.90%)		(15.40%)
Provision for credit losses	168	274	404	529
Provision for credit losses, Percent change	(38.70%)		(23.60%)
Income before income taxes	548	588	1,046	1,185
Income before income taxes, Percent change	(6.80%)		(11.70%)
Income taxes and taxable-equivalent adjustment	199	214	380	431
Income taxes and taxable-equivalent adjustment, Percent change	(7.00%)		(11.80%)
Net income	349	374	666	754
Net income, Percent change	(6.70%)		(11.70%)
Net (income) loss attributable to noncontrolling interests
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp	349	374	666	754
Net income attributable to U.S. Bancorp, Percent change	(6.70%)		(11.70%)
Average Balance Sheet
Commercial	8,423	8,084	8,367	7,991
Commercial, Percent change	4.20%		4.70%
Commercial real estate	16,765	16,083	16,666	15,996
Commercial real estate, Percent change	4.20%		4.20%
Residential mortgages	46,084	38,727	45,296	38,052
Residential mortgages, Percent change	19.00%		19.00%
Credit card
Credit card, Percent change
Other retail	44,570	45,570	44,743	45,576
Other retail, Percent change	(2.20%)		(1.80%)
Total loans, excluding covered loans	115,842	108,464	115,072	107,615
Total loans, excluding covered loans, Percent change	6.80%		6.90%
Covered loans	6,724	7,640	6,832	7,766
Covered loans, Percent change	(12.00%)		(12.00%)
Total loans	122,566	116,104	121,904	115,381
Total loans, Percent change	5.60%		5.70%
Goodwill	3,515	3,515	3,514	3,515
Goodwill, Percent change
Other intangible assets	2,208	1,824	2,112	1,794
Other intangible assets, Percent change	21.10%		17.70%
Assets	138,303	132,730	138,779	131,719
Assets, Percent change	4.20%		5.40%
Noninterest-bearing deposits	21,889	19,366	21,631	19,048
Noninterest-bearing deposits, Percent change	13.00%		13.60%
Interest checking	33,080	29,934	32,754	29,470
Interest checking, Percent change	10.50%		11.10%
Savings products	46,203	43,214	45,914	42,772
Savings products, Percent change	6.90%		7.30%
Time deposits	21,666	24,242	22,075	24,306
Time deposits, Percent change	(10.60%)		(9.20%)
Total deposits	122,838	116,756	122,374	115,596
Total deposits, Percent change	5.20%		5.90%
Total U.S. Bancorp shareholders' equity	12,063	11,106	12,026	10,937
Total U.S. Bancorp shareholders' equity, Percent change	8.60%		10.00%
Wealth Management and Securities Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	91	83	183	177
Net interest income (taxable-equivalent basis), Percent change	9.60%		3.40%
Noninterest income	310	278	604	545
Noninterest income, Percent change	11.50%		10.80%
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	401	361	787	722
Total net revenue, Percent change	11.10%		9.00%
Noninterest expense	319	285	641	566
Noninterest expense, Percent change	11.90%		13.30%
Other intangibles	9	10	18	20
Other intangibles, Percent change	(10.00%)		(10.00%)
Total noninterest expense	328	295	659	586
Total noninterest expense, Percent change	11.20%		12.50%
Income before provision and income taxes	73	66	128	136
Income before provision and income taxes, Percent change	10.60%		(5.90%)
Provision for credit losses	1	2	1	1
Provision for credit losses, Percent change	(50.00%)
Income before income taxes	72	64	127	135
Income before income taxes, Percent change	12.50%		(5.90%)
Income taxes and taxable-equivalent adjustment	26	23	46	49
Income taxes and taxable-equivalent adjustment, Percent change	13.00%		(6.10%)
Net income	46	41	81	86
Net income, Percent change	12.20%		(5.80%)
Net (income) loss attributable to noncontrolling interests
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp	46	41	81	86
Net income attributable to U.S. Bancorp, Percent change	12.20%		(5.80%)
Average Balance Sheet
Commercial	1,794	1,270	1,767	1,213
Commercial, Percent change	41.30%		45.70%
Commercial real estate	651	604	650	594
Commercial real estate, Percent change	7.80%		9.40%
Residential mortgages	759	372	670	377
Residential mortgages, Percent change			77.70%
Credit card
Credit card, Percent change
Other retail	1,548	1,512	1,550	1,510
Other retail, Percent change	2.40%		2.60%
Total loans, excluding covered loans	4,752	3,758	4,637	3,694
Total loans, excluding covered loans, Percent change	26.50%		25.50%
Covered loans	15	12	12	12
Covered loans, Percent change	25.00%
Total loans	4,767	3,770	4,649	3,706
Total loans, Percent change	26.40%		25.40%
Goodwill	1,527	1,469	1,528	1,468
Goodwill, Percent change	3.90%		4.10%
Other intangible assets	173	175	177	176
Other intangible assets, Percent change	(1.10%)		0.60%
Assets	7,620	6,479	7,511	6,366
Assets, Percent change	17.60%		18.00%
Noninterest-bearing deposits	13,805	13,476	13,950	13,419
Noninterest-bearing deposits, Percent change	2.40%		4.00%
Interest checking	4,672	3,833	4,686	3,952
Interest checking, Percent change	21.90%		18.60%
Savings products	28,021	23,114	27,456	23,257
Savings products, Percent change	21.20%		18.10%
Time deposits	5,585	4,662	5,766	4,603
Time deposits, Percent change	19.80%		25.30%
Total deposits	52,083	45,085	51,858	45,231
Total deposits, Percent change	15.50%		14.70%
Total U.S. Bancorp shareholders' equity	2,370	2,224	2,366	2,214
Total U.S. Bancorp shareholders' equity, Percent change	6.60%		6.90%
Payment Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	387	376	775	772
Net interest income (taxable-equivalent basis), Percent change	2.90%		0.40%
Noninterest income	828	816	1,575	1,548
Noninterest income, Percent change	1.50%		1.70%
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	1,215	1,192	2,350	2,320
Total net revenue, Percent change	1.90%		1.30%
Noninterest expense	491	445	970	899
Noninterest expense, Percent change	10.30%		7.90%
Other intangibles	34	43	69	87
Other intangibles, Percent change	(20.90%)		(20.70%)
Total noninterest expense	525	488	1,039	986
Total noninterest expense, Percent change	7.60%		5.40%
Income before provision and income taxes	690	704	1,311	1,334
Income before provision and income taxes, Percent change	(2.00%)		(1.70%)
Provision for credit losses	183	197	388	413
Provision for credit losses, Percent change	(7.10%)		(6.10%)
Income before income taxes	507	507	923	921
Income before income taxes, Percent change			0.20%
Income taxes and taxable-equivalent adjustment	184	184	335	335
Income taxes and taxable-equivalent adjustment, Percent change
Net income	323	323	588	586
Net income, Percent change			0.30%
Net (income) loss attributable to noncontrolling interests	(10)	(10)	(19)	(20)
Net (income) loss attributable to noncontrolling interests, Percent change			5.00%
Net income attributable to U.S. Bancorp	313	313	569	566
Net income attributable to U.S. Bancorp, Percent change			0.50%
Average Balance Sheet
Commercial	6,035	6,001	5,948	5,824
Commercial, Percent change	0.60%		2.10%
Commercial real estate
Commercial real estate, Percent change
Residential mortgages
Residential mortgages, Percent change
Credit card	16,416	16,696	16,472	16,737
Credit card, Percent change	(1.70%)		(1.60%)
Other retail	741	814	752	825
Other retail, Percent change	(9.00%)		(8.80%)
Total loans, excluding covered loans	23,192	23,511	23,172	23,386
Total loans, excluding covered loans, Percent change	(1.40%)		(0.90%)
Covered loans	5	5	5	5
Covered loans, Percent change
Total loans	23,197	23,516	23,177	23,391
Total loans, Percent change	(1.40%)		(0.90%)
Goodwill	2,508	2,350	2,508	2,350
Goodwill, Percent change	6.70%		6.70%
Other intangible assets	585	734	598	753
Other intangible assets, Percent change	(20.30%)		(20.60%)
Assets	29,401	29,785	29,421	29,768
Assets, Percent change	(1.30%)		(1.20%)
Noninterest-bearing deposits	675	632	683	646
Noninterest-bearing deposits, Percent change	6.80%		5.70%
Interest checking	448	1,336	439	1,320
Interest checking, Percent change	(66.50%)		(66.70%)
Savings products	54	37	50	36
Savings products, Percent change	45.90%		38.90%
Time deposits
Time deposits, Percent change
Total deposits	1,177	2,005	1,172	2,002
Total deposits, Percent change	(41.30%)		(41.50%)
Total U.S. Bancorp shareholders' equity	6,020	5,670	5,985	5,699
Total U.S. Bancorp shareholders' equity, Percent change	6.20%		5.00%
Treasury and Corporate Support [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	543	553	1,109	1,037
Net interest income (taxable-equivalent basis), Percent change	(1.80%)		6.90%
Noninterest income	83	55	140	119
Noninterest income, Percent change	50.90%		17.60%
Securities gains (losses), net	6	(19)	11	(19)
Securities gains (losses), net, Percent change
Total net revenue	632	589	1,260	1,137
Total net revenue, Percent change	7.30%		10.80%
Noninterest expense	197	270	302	524
Noninterest expense, Percent change	(27.00%)		(42.40%)
Other intangibles
Other intangibles, Percent change
Total noninterest expense	197	270	302	524
Total noninterest expense, Percent change	(27.00%)		(42.40%)
Income before provision and income taxes	435	319	958	613
Income before provision and income taxes, Percent change	36.40%		56.30%
Provision for credit losses	40	(3)	47	5
Provision for credit losses, Percent change
Income before income taxes	395	322	911	608
Income before income taxes, Percent change	22.70%		49.80%
Income taxes and taxable-equivalent adjustment	(8)	10	66	10
Income taxes and taxable-equivalent adjustment, Percent change
Net income	403	312	845	598
Net income, Percent change	29.20%		41.30%
Net (income) loss attributable to noncontrolling interests	50	47	100	90
Net (income) loss attributable to noncontrolling interests, Percent change	6.40%		11.10%
Net income attributable to U.S. Bancorp	453	359	945	688
Net income attributable to U.S. Bancorp, Percent change	26.20%		37.40%
Average Balance Sheet
Commercial	178	186	171	183
Commercial, Percent change	(4.30%)		(6.60%)
Commercial real estate	102	142	104	107
Commercial real estate, Percent change	(28.20%)		(2.80%)
Residential mortgages	1	4	1	5
Residential mortgages, Percent change	(75.00%)		(80.00%)
Credit card
Credit card, Percent change
Other retail
Other retail, Percent change
Total loans, excluding covered loans	281	332	276	295
Total loans, excluding covered loans, Percent change	(15.40%)		(6.40%)
Covered loans	3,270	5,004	3,437	5,236
Covered loans, Percent change	(34.70%)		(34.40%)
Total loans	3,551	5,336	3,713	5,531
Total loans, Percent change	(33.50%)		(32.90%)
Goodwill
Goodwill, Percent change
Other intangible assets	2	4	3	4
Other intangible assets, Percent change	(50.00%)		(25.00%)
Assets	96,351	100,055	97,959	100,597
Assets, Percent change	(3.70%)		(2.60%)
Noninterest-bearing deposits	295	500	318	474
Noninterest-bearing deposits, Percent change	(41.00%)		(32.90%)
Interest checking	1	1	1	1
Interest checking, Percent change
Savings products	81	139	88	134
Savings products, Percent change	(41.70%)		(34.30%)
Time deposits	1,153	894	993	548
Time deposits, Percent change	29.00%		81.20%
Total deposits	1,530	1,534	1,400	1,157
Total deposits, Percent change	(0.30%)		21.00%
Total U.S. Bancorp shareholders' equity	12,105	11,933	11,887	11,193
Total U.S. Bancorp shareholders' equity, Percent change	1.40%		6.20%
Consolidated Company [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	2,672	2,713	5,381	5,403
Net interest income (taxable-equivalent basis), Percent change	(1.50%)		(0.40%)
Noninterest income	2,270	2,374	4,430	4,613
Noninterest income, Percent change	(4.40%)		(4.00%)
Securities gains (losses), net	6	(19)	11	(19)
Securities gains (losses), net, Percent change
Total net revenue	4,948	5,068	9,822	9,997
Total net revenue, Percent change	(2.40%)		(1.80%)
Noninterest expense	2,502	2,531	4,915	5,020
Noninterest expense, Percent change	(1.10%)		(2.10%)
Other intangibles	55	70	112	141
Other intangibles, Percent change	(21.40%)		(20.60%)
Total noninterest expense	2,557	2,601	5,027	5,161
Total noninterest expense, Percent change	(1.70%)		(2.60%)
Income before provision and income taxes	2,391	2,467	4,795	4,836
Income before provision and income taxes, Percent change	(3.10%)		(0.80%)
Provision for credit losses	362	470	765	951
Provision for credit losses, Percent change	(23.00%)		(19.60%)
Income before income taxes	2,029	1,997	4,030	3,885
Income before income taxes, Percent change	1.60%		3.70%
Income taxes and taxable-equivalent adjustment	585	619	1,199	1,202
Income taxes and taxable-equivalent adjustment, Percent change	(5.50%)		(0.20%)
Net income	1,444	1,378	2,831	2,683
Net income, Percent change	4.80%		5.50%
Net (income) loss attributable to noncontrolling interests	40	37	81	70
Net (income) loss attributable to noncontrolling interests, Percent change	8.10%		15.70%
Net income attributable to U.S. Bancorp	1,484	1,415	2,912	2,753
Net income attributable to U.S. Bancorp, Percent change	4.90%		5.80%
Average Balance Sheet
Commercial	66,762	60,020	66,034	58,576
Commercial, Percent change	11.20%		12.70%
Commercial real estate	37,884	36,549	37,553	36,267
Commercial real estate, Percent change	3.70%		3.50%
Residential mortgages	46,873	39,166	45,996	38,498
Residential mortgages, Percent change	19.70%		19.50%
Credit card	16,416	16,696	16,472	16,737
Credit card, Percent change	(1.70%)		(1.60%)
Other retail	46,866	47,900	47,055	47,915
Other retail, Percent change	(2.20%)		(1.80%)
Total loans, excluding covered loans	214,801	200,331	213,110	197,993
Total loans, excluding covered loans, Percent change	7.20%		7.60%
Covered loans	10,385	13,738	10,701	14,122
Covered loans, Percent change	(24.40%)		(24.20%)
Total loans	225,186	214,069	223,811	212,115
Total loans, Percent change	5.20%		5.50%
Goodwill	9,154	8,938	9,154	8,937
Goodwill, Percent change	2.40%		2.40%
Other intangible assets	2,994	2,775	2,917	2,767
Other intangible assets, Percent change	7.90%		5.40%
Assets	349,589	340,429	350,483	338,358
Assets, Percent change	2.70%		3.60%
Noninterest-bearing deposits	66,866	64,531	66,634	64,057
Noninterest-bearing deposits, Percent change	3.60%		4.00%
Interest checking	48,403	45,928	48,404	46,693
Interest checking, Percent change	5.40%		3.70%
Savings products	87,297	74,012	85,908	74,392
Savings products, Percent change	17.90%		15.50%
Time deposits	44,819	46,830	45,262	44,650
Time deposits, Percent change	(4.30%)		1.40%
Total deposits	247,385	231,301	246,208	229,792
Total deposits, Percent change	7.00%		7.10%
Total U.S. Bancorp shareholders' equity	$ 39,904	$ 37,266	$ 39,543	$ 36,341
Total U.S. Bancorp shareholders' equity, Percent change	7.10%		8.80%