Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Condensed Income Statement
Securities gains (losses), net	$ (8)	$ (21)	$ (13)	$ (55)
Other intangibles	75	91	150	188
Total noninterest expense	2,425	2,377	4,739	4,513
Provision for credit losses	572	1,139	1,327	2,449
Net income	1,179	752	2,208	1,415
Net (income) loss attributable to noncontrolling interests	24	14	41	20
Net income attributable to U.S. Bancorp	1,203	766	2,249	1,435
Wholesale Banking and Commercial Real Estate [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	525	490	1,034	952
Net interest income (taxable-equivalent basis), percent change	7.10%		8.60%
Noninterest income	326	283	619	553
Noninterest income, percent change	15.20%		11.90%
Total net revenue	851	773	1,653	1,505
Total net revenue, percent change	10.10%		9.80%
Noninterest expense	322	298	616	566
Noninterest expense, percent change	8.10%		8.80%
Other intangibles	4	4	8	9
Other intangibles, percent change			(11.10%)
Total noninterest expense	326	302	624	575
Total noninterest expense, percent change	7.90%		8.50%
Income before provision and income taxes	525	471	1,029	930
Income before provision and income taxes, percent change	11.50%		10.60%
Provision for credit losses	115	319	293	761
Provision for credit losses, percent change	(63.90%)		(61.50%)
Income before income taxes	410	152	736	169
Income taxes and taxable-equivalent adjustment	149	55	268	60
Net income	261	97	468	109
Net (income) loss attributable to noncontrolling interests	4	(1)	5
Net income attributable to U.S. Bancorp	265	96	473	109
Average Balance Sheet
Commercial	36,075	32,840	35,669	33,319
Commercial, percent change	9.90%		7.10%
Commercial real estate	19,103	19,452	19,155	19,665
Commercial real estate, percent change	(1.80%)		(2.60%)
Residential mortgages	54	71	58	69
Residential mortgages, percent change	(23.90%)		(15.90%)
Retail	6	51	6	48
Retail, percent change	(88.20%)		(87.50%)
Total loans, excluding covered loans	55,238	52,414	54,888	53,101
Total loans excluding covered loans, percent change	5.40%		3.40%
Covered loans	1,599	2,030	1,730	2,091
Covered loans, percent change	(21.20%)		(17.30%)
Total loans	56,837	54,444	56,618	55,192
Total loans, percent change	4.40%		2.60%
Goodwill	1,604	1,608	1,604	1,608
Goodwill, percent change	(0.20%)		(0.20%)
Other intangible assets	55	71	57	73
Other intangible assets, percent change	(22.50%)		(21.90%)
Assets	63,028	59,999	62,460	60,463
Assets, percent change	5.00%		3.30%
Noninterest-bearing deposits	23,273	17,371	21,650	16,758
Noninterest-bearing deposits, percent change	34.00%		29.20%
Interest checking	14,149	12,841	14,074	13,385
Interest checking, percent change	10.20%		5.10%
Savings products	9,350	9,758	9,580	10,454
Savings products, percent change	(4.20%)		(8.40%)
Time deposits	12,609	10,876	12,635	10,977
Time deposits, percent change	15.90%		15.10%
Total deposits	59,381	50,846	57,939	51,574
Total deposits, percent change	16.80%		12.30%
Total U.S. Bancorp shareholders' equity	5,497	5,373	5,502	5,391
Total U.S. Bancorp shareholders' equity, percent change	2.30%		2.10%
Consumer and Small Business Banking [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	1,123	1,071	2,256	2,104
Net interest income (taxable-equivalent basis), percent change	4.90%		7.20%
Noninterest income	687	707	1,294	1,370
Noninterest income, percent change	(2.80%)		(5.50%)
Total net revenue	1,810	1,778	3,550	3,474
Total net revenue, percent change	1.80%		2.20%
Noninterest expense	1,116	1,067	2,217	2,088
Noninterest expense, percent change	4.60%		6.20%
Other intangibles	18	24	36	51
Other intangibles, percent change	(25.00%)		(29.40%)
Total noninterest expense	1,134	1,091	2,253	2,139
Total noninterest expense, percent change	3.90%		5.30%
Income before provision and income taxes	676	687	1,297	1,335
Income before provision and income taxes, percent change	(1.60%)		(2.80%)
Provision for credit losses	372	447	774	843
Provision for credit losses, percent change	(16.80%)		(8.20%)
Income before income taxes	304	240	523	492
Income before income taxes, percent change	26.70%		6.30%
Income taxes and taxable-equivalent adjustment	111	87	191	182
Income taxes and taxable-equivalent adjustment, percent change	27.60%		4.90%
Net income	193	153	332	310
Net income, percent change	26.10%		7.10%
Net (income) loss attributable to noncontrolling interests	(1)	(1)	(1)	(1)
Net income attributable to U.S. Bancorp	192	152	331	309
Net income attributable to U.S. Bancorp, percent change	26.30%		7.10%
Average Balance Sheet
Commercial	7,197	7,141	7,156	7,180
Commercial, percent change	0.80%		(0.30%)
Commercial real estate	15,590	13,786	15,355	13,503
Commercial real estate, percent change	13.10%		13.70%
Residential mortgages	32,282	26,364	31,802	26,162
Residential mortgages, percent change	22.40%		21.60%
Retail	45,450	44,381	45,496	44,491
Retail, percent change	2.40%		2.30%
Total loans, excluding covered loans	100,519	91,672	99,809	91,336
Total loans excluding covered loans, percent change	9.70%		9.30%
Covered loans	8,488	9,756	8,621	9,861
Covered loans, percent change	(13.00%)		(12.60%)
Total loans	109,007	101,428	108,430	101,197
Total loans, percent change	7.50%		7.10%
Goodwill	3,515	3,534	3,525	3,531
Goodwill, percent change	(0.50%)		(0.20%)
Other intangible assets	2,244	2,005	2,236	2,030
Other intangible assets, percent change	11.90%		10.10%
Assets	121,847	114,379	122,630	113,983
Assets, percent change	6.50%		7.60%
Noninterest-bearing deposits	17,837	15,994	17,510	15,785
Noninterest-bearing deposits, percent change	11.50%		10.90%
Interest checking	26,110	23,903	25,743	23,569
Interest checking, percent change	9.20%		9.20%
Savings products	40,530	35,763	40,067	34,904
Savings products, percent change	13.30%		14.80%
Time deposits	24,629	26,510	24,456	27,411
Time deposits, percent change	(7.10%)		(10.80%)
Total deposits	109,106	102,170	107,776	101,669
Total deposits, percent change	6.80%		6.00%
Total U.S. Bancorp shareholders' equity	9,236	8,395	9,249	8,413
Total U.S. Bancorp shareholders' equity, percent change	10.00%		9.90%
Wealth Management and Securities Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	86	78	175	143
Net interest income (taxable-equivalent basis), percent change	10.30%		22.40%
Noninterest income	271	277	540	553
Noninterest income, percent change	(2.20%)		(2.40%)
Total net revenue	357	355	715	696
Total net revenue, percent change	0.60%		2.70%
Noninterest expense	281	246	546	479
Noninterest expense, percent change	14.20%		14.00%
Other intangibles	10	13	20	27
Other intangibles, percent change	(23.10%)		(25.90%)
Total noninterest expense	291	259	566	506
Total noninterest expense, percent change	12.40%		11.90%
Income before provision and income taxes	66	96	149	190
Income before provision and income taxes, percent change	(31.30%)		(21.60%)
Provision for credit losses	(6)	2	(1)	4
Income before income taxes	72	94	150	186
Income before income taxes, percent change	(23.40%)		(19.40%)
Income taxes and taxable-equivalent adjustment	26	34	54	65
Income taxes and taxable-equivalent adjustment, percent change	(23.50%)		(16.90%)
Net income	46	60	96	121
Net income, percent change	(23.30%)		(20.70%)
Net income attributable to U.S. Bancorp	46	60	96	121
Net income attributable to U.S. Bancorp, percent change	(23.30%)		(20.70%)
Average Balance Sheet
Commercial	1,077	1,085	1,048	1,058
Commercial, percent change	(0.70%)		(0.90%)
Commercial real estate	580	569	585	566
Commercial real estate, percent change	1.90%		3.40%
Residential mortgages	392	372	387	373
Residential mortgages, percent change	5.40%		3.80%
Retail	1,579	1,596	1,613	1,564
Retail, percent change	(1.10%)		3.10%
Total loans, excluding covered loans	3,628	3,622	3,633	3,561
Total loans excluding covered loans, percent change	0.20%		2.00%
Covered loans	13	15	13	15
Covered loans, percent change	(13.30%)		(13.30%)
Total loans	3,641	3,637	3,646	3,576
Total loans, percent change	0.10%		2.00%
Goodwill	1,463	1,522	1,463	1,518
Goodwill, percent change	(3.90%)		(3.60%)
Other intangible assets	188	208	192	214
Other intangible assets, percent change	(9.60%)		(10.30%)
Assets	6,025	5,808	6,033	5,769
Assets, percent change	3.70%		4.60%
Noninterest-bearing deposits	6,636	5,749	6,392	5,560
Noninterest-bearing deposits, percent change	15.40%		15.00%
Interest checking	2,900	2,636	3,003	2,656
Interest checking, percent change	10.00%		13.10%
Savings products	21,413	14,527	21,399	13,965
Savings products, percent change	47.40%		53.20%
Time deposits	8,459	5,884	8,769	5,644
Time deposits, percent change	43.80%		55.40%
Total deposits	39,408	28,796	39,563	27,825
Total deposits, percent change	36.90%		42.20%
Total U.S. Bancorp shareholders' equity	2,078	2,119	2,077	2,118
Total U.S. Bancorp shareholders' equity, percent change	(1.90%)		(1.90%)
Payment Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	326	332	656	678
Net interest income (taxable-equivalent basis), percent change	(1.80%)		(3.20%)
Noninterest income	831	791	1,592	1,533
Noninterest income, percent change	5.10%		3.80%
Total net revenue	1,157	1,123	2,248	2,211
Total net revenue, percent change	3.00%		1.70%
Noninterest expense	437	416	850	800
Noninterest expense, percent change	5.00%		6.30%
Other intangibles	43	50	86	101
Other intangibles, percent change	(14.00%)		(14.90%)
Total noninterest expense	480	466	936	901
Total noninterest expense, percent change	3.00%		3.90%
Income before provision and income taxes	677	657	1,312	1,310
Income before provision and income taxes, percent change	3.00%		0.20%
Provision for credit losses	89	358	254	821
Provision for credit losses, percent change	(75.10%)		(69.10%)
Income before income taxes	588	299	1,058	489
Income before income taxes, percent change	96.70%
Income taxes and taxable-equivalent adjustment	214	109	385	177
Income taxes and taxable-equivalent adjustment, percent change	96.30%
Net income	374	190	673	312
Net income, percent change	96.80%
Net (income) loss attributable to noncontrolling interests	(10)	(8)	(19)	(15)
Net income attributable to noncontrolling interests, percent change	(25.00%)		(26.70%)
Net income attributable to U.S. Bancorp	364	182	654	297
Average Balance Sheet
Commercial	5,627	5,162	5,425	5,023
Commercial, percent change	9.00%		8.00%
Retail	16,789	17,338	16,928	17,375
Retail, percent change	(3.20%)		(2.60%)
Total loans, excluding covered loans	22,416	22,500	22,353	22,398
Total loans excluding covered loans, percent change	(0.40%)		(0.20%)
Covered loans	5	0	1	0
Total loans	22,421	22,500	22,354	22,398
Total loans, percent change	(0.40%)		(0.20%)
Goodwill	2,370	2,335	2,364	2,348
Goodwill, percent change	1.50%		0.70%
Other intangible assets	807	971	823	987
Other intangible assets, percent change	(16.90%)		(16.60%)
Assets	27,564	27,212	27,399	27,098
Assets, percent change	1.30%		1.10%
Noninterest-bearing deposits	711	611	698	610
Noninterest-bearing deposits, percent change	16.40%		14.40%
Interest checking	173	115	169	110
Interest checking, percent change	50.40%		53.60%
Savings products	29	23	28	22
Savings products, percent change	26.10%		27.30%
Time deposits		1		1
Total deposits	913	750	895	743
Total deposits, percent change	21.70%		20.50%
Total U.S. Bancorp shareholders' equity	5,245	5,286	5,270	5,318
Total U.S. Bancorp shareholders' equity, percent change	(0.80%)		(0.90%)
Treasury and Corporate Support [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	484	438	930	935
Net interest income (taxable-equivalent basis), percent change	10.50%		(0.50%)
Noninterest income	39	73	126	74
Noninterest income, percent change	(46.40%)		70.30%
Securities gains (losses), net	(8)	(21)	(13)	(55)
Securities gains (losses), net, percent change	61.90%		76.40%
Total net revenue	515	490	1,043	954
Total net revenue, percent change	5.10%		9.30%
Noninterest expense	194	259	360	392
Noninterest expense, percent change	(25.10%)		(8.20%)
Total noninterest expense	194	259	360	392
Total noninterest expense, percent change	(25.10%)		(8.20%)
Income before provision and income taxes	321	231	683	562
Income before provision and income taxes, percent change	39.00%		21.50%
Provision for credit losses	2	13	7	20
Provision for credit losses, percent change	(84.60%)		(65.00%)
Income before income taxes	319	218	676	542
Income before income taxes, percent change	46.30%		24.70%
Income taxes and taxable-equivalent adjustment	14	(34)	37	(21)
Net income	305	252	639	563
Net income, percent change	21.00%		13.50%
Net (income) loss attributable to noncontrolling interests	31	24	56	36
Net income attributable to noncontrolling interests, percent change	29.20%		55.60%
Net income attributable to U.S. Bancorp	336	276	695	599
Net income attributable to U.S. Bancorp, percent change	21.70%		16.00%
Average Balance Sheet
Commercial	78	112	89	225
Commercial, percent change	(30.40%)		(60.40%)
Commercial real estate	226	357	245	419
Commercial real estate, percent change	(36.70%)		(41.50%)
Residential mortgages	6	14	11	12
Residential mortgages, percent change	(57.10%)		(8.30%)
Retail	0	16	0	24
Total loans, excluding covered loans	310	499	345	680
Total loans excluding covered loans, percent change	(37.90%)		(49.30%)
Covered loans	6,594	8,653	6,801	8,972
Covered loans, percent change	(23.80%)		(24.20%)
Total loans	6,904	9,152	7,146	9,652
Total loans, percent change	(24.60%)		(26.00%)
Other intangible assets	5	7	5	6
Other intangible assets, percent change	(28.60%)		(16.70%)
Assets	94,146	73,942	91,744	74,217
Assets, percent change	27.30%		23.60%
Noninterest-bearing deposits	264	192	217	251
Noninterest-bearing deposits, percent change	37.50%		(13.50%)
Interest checking	2	8	2	27
Interest checking, percent change	(75.00%)		(92.60%)
Savings products	214	220	185	270
Savings products, percent change	(2.70%)		(31.50%)
Time deposits	123	336	294	568
Time deposits, percent change	(63.40%)		(48.20%)
Total deposits	603	756	698	1,116
Total deposits, percent change	(20.20%)		(37.50%)
Total U.S. Bancorp shareholders' equity	9,911	6,246	8,896	5,679
Total U.S. Bancorp shareholders' equity, percent change	58.70%		56.60%
Consolidated company [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	2,544	2,409	5,051	4,812
Net interest income (taxable-equivalent basis), percent change	5.60%		5.00%
Noninterest income	2,154	2,131	4,171	4,083
Noninterest income, percent change	1.10%		2.20%
Securities gains (losses), net	(8)	(21)	(13)	(55)
Securities gains (losses), net, percent change	61.90%		76.40%
Total net revenue	4,690	4,519	9,209	8,840
Total net revenue, percent change	3.80%		4.20%
Noninterest expense	2,350	2,286	4,589	4,325
Noninterest expense, percent change	2.80%		6.10%
Other intangibles	75	91	150	188
Other intangibles, percent change	(17.60%)		(20.20%)
Total noninterest expense	2,425	2,377	4,739	4,513
Total noninterest expense, percent change	2.00%		5.00%
Income before provision and income taxes	2,265	2,142	4,470	4,327
Income before provision and income taxes, percent change	5.70%		3.30%
Provision for credit losses	572	1,139	1,327	2,449
Provision for credit losses, percent change	(49.80%)		(45.80%)
Income before income taxes	1,693	1,003	3,143	1,878
Income before income taxes, percent change	68.80%		67.40%
Income taxes and taxable-equivalent adjustment	514	251	935	463
Net income	1,179	752	2,208	1,415
Net income, percent change	56.80%		56.00%
Net (income) loss attributable to noncontrolling interests	24	14	41	20
Net income attributable to noncontrolling interests, percent change	71.40%
Net income attributable to U.S. Bancorp	1,203	766	2,249	1,435
Net income attributable to U.S. Bancorp, percent change	57.00%		56.70%
Average Balance Sheet
Commercial	50,054	46,340	49,387	46,805
Commercial, percent change	8.00%		5.50%
Commercial real estate	35,499	34,164	35,340	34,153
Commercial real estate, percent change	3.90%		3.50%
Residential mortgages	32,734	26,821	32,258	26,616
Residential mortgages, percent change	22.00%		21.20%
Retail	63,824	63,382	64,043	63,502
Retail, percent change	0.70%		0.90%
Total loans, excluding covered loans	182,111	170,707	181,028	171,076
Total loans excluding covered loans, percent change	6.70%		5.80%
Covered loans	16,699	20,454	17,166	20,939
Covered loans, percent change	(18.40%)		(18.00%)
Total loans	198,810	191,161	198,194	192,015
Total loans, percent change	4.00%		3.20%
Goodwill	8,952	8,999	8,956	9,005
Goodwill, percent change	(0.50%)		(0.50%)
Other intangible assets	3,299	3,262	3,313	3,310
Other intangible assets, percent change	1.10%		0.10%
Assets	312,610	281,340	310,266	281,530
Assets, percent change	11.10%		10.20%
Noninterest-bearing deposits	48,721	39,917	46,467	38,964
Noninterest-bearing deposits, percent change	22.10%		19.30%
Interest checking	43,334	39,503	42,991	39,747
Interest checking, percent change	9.70%		8.20%
Savings products	71,536	60,291	71,259	59,615
Savings products, percent change	18.70%		19.50%
Time deposits	45,820	43,607	46,154	44,601
Time deposits, percent change	5.10%		3.50%
Total deposits	209,411	183,318	206,871	182,927
Total deposits, percent change	14.20%		13.10%
Total U.S. Bancorp shareholders' equity	$ 31,967	$ 27,419	$ 30,994	$ 26,919
Total U.S. Bancorp shareholders' equity, percent change	16.60%		15.10%