Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Income Statement
Securities gains (losses), net		$ (5)
Other intangibles	71	75
Total noninterest expense	2,560	2,314
Net income	1,305	1,029
Net (income) loss attributable to noncontrolling interests	(33)	(17)
Net income attributable to U.S. Bancorp	1,338	1,046
Wholesale Banking and Commercial Real Estate [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	528	514
Net interest income (taxable-equivalent basis), percent change	2.70%
Noninterest income	309	293
Noninterest income, percent change	5.50%
Securities gains (losses), net
Securities gains (losses), net, percent change
Total net revenue	837	807
Total net revenue, percent change	3.70%
Noninterest expense	317	299
Noninterest expense, percent change	6.00%
Other intangibles	4	4
Total noninterest expense	321	303
Total noninterest expense, percent change	5.90%
Income before provision and income taxes	516	504
Income before provision and income taxes, percent change	2.40%
Provision for credit losses	3	179
Provision for credit losses, percent change	(98.30%)
Income before income taxes	513	325
Income before income taxes, percent change	57.80%
Income taxes and taxable-equivalent adjustment	187	118
Income taxes and taxable-equivalent adjustment, percent change	58.50%
Net income	326	207
Net income, percent change	57.50%
Net (income) loss attributable to noncontrolling interests		1
Net income attributable to U.S. Bancorp	326	208
Net income attributable to U.S. Bancorp, percent change	56.70%
Average Balance Sheet
Commercial	42,372	35,253
Commercial, percent change	20.20%
Commercial real estate	19,344	19,190
Commercial real estate, percent change	0.80%
Residential mortgages	64	73
Residential mortgages, percent change	(12.30%)
Other retail	4	6
Other retail, percent change	(33.30%)
Total loans, excluding covered loans	61,784	54,522
Total loans excluding covered loans, percent change	13.30%
Covered loans	1,202	2,001
Covered loans, percent change	(39.90%)
Total loans	62,986	56,523
Total loans, percent change	11.40%
Goodwill	1,604	1,604
Other intangible assets	42	59
Other intangible assets, percent change	(28.80%)
Assets	68,551	62,008
Assets, percent change	10.60%
Noninterest-bearing deposits	30,334	20,019
Noninterest-bearing deposits, percent change	51.50%
Interest checking	13,114	13,993
Interest checking, percent change	(6.30%)
Savings products	8,735	9,823
Savings products, percent change	(11.10%)
Time deposits	13,254	14,811
Time deposits, percent change	(10.50%)
Total deposits	65,437	58,646
Total deposits, percent change	11.60%
Total U.S. Bancorp shareholders' equity	6,275	5,509
Total U.S. Bancorp shareholders' equity, percent change	13.90%
Consumer and Small Business Banking [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	1,179	1,134
Net interest income (taxable-equivalent basis), percent change	4.00%
Noninterest income	867	606
Noninterest income, percent change	43.10%
Securities gains (losses), net
Securities gains (losses), net, percent change
Total net revenue	2,046	1,740
Total net revenue, percent change	17.60%
Noninterest expense	1,167	1,097
Noninterest expense, percent change	6.40%
Other intangibles	13	19
Other intangibles, percent change	(31.60%)
Total noninterest expense	1,180	1,116
Total noninterest expense, percent change	5.70%
Income before provision and income taxes	866	624
Income before provision and income taxes, percent change	38.80%
Provision for credit losses	253	401
Provision for credit losses, percent change	(36.90%)
Income before income taxes	613	223
Income taxes and taxable-equivalent adjustment	223	81
Net income	390	142
Net income attributable to U.S. Bancorp	390	142
Average Balance Sheet
Commercial	7,890	7,117
Commercial, percent change	10.90%
Commercial real estate	15,904	15,153
Commercial real estate, percent change	5.00%
Residential mortgages	37,375	31,319
Residential mortgages, percent change	19.30%
Other retail	45,551	45,555
Total loans, excluding covered loans	106,720	99,144
Total loans excluding covered loans, percent change	7.60%
Covered loans	7,895	8,741
Covered loans, percent change	(9.70%)
Total loans	114,615	107,885
Total loans, percent change	6.20%
Goodwill	3,515	3,536
Goodwill, percent change	(0.60%)
Other intangible assets	1,765	2,227
Other intangible assets, percent change	(20.70%)
Assets	130,681	123,191
Assets, percent change	6.10%
Noninterest-bearing deposits	18,713	17,170
Noninterest-bearing deposits, percent change	9.00%
Interest checking	28,938	25,383
Interest checking, percent change	14.00%
Savings products	42,466	39,591
Savings products, percent change	7.30%
Time deposits	24,408	24,282
Time deposits, percent change	0.50%
Total deposits	114,525	106,426
Total deposits, percent change	7.60%
Total U.S. Bancorp shareholders' equity	10,768	9,262
Total U.S. Bancorp shareholders' equity, percent change	16.30%
Wealth Management and Securities Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	92	87
Net interest income (taxable-equivalent basis), percent change	5.70%
Noninterest income	267	269
Noninterest income, percent change	(0.70%)
Securities gains (losses), net
Securities gains (losses), net, percent change
Total net revenue	359	356
Total net revenue, percent change	0.80%
Noninterest expense	280	262
Noninterest expense, percent change	6.90%
Other intangibles	10	9
Other intangibles, percent change	11.10%
Total noninterest expense	290	271
Total noninterest expense, percent change	7.00%
Income before provision and income taxes	69	85
Income before provision and income taxes, percent change	(18.80%)
Provision for credit losses	(1)	3
Income before income taxes	70	82
Income before income taxes, percent change	(14.60%)
Income taxes and taxable-equivalent adjustment	25	30
Income taxes and taxable-equivalent adjustment, percent change	(16.70%)
Net income	45	52
Net income, percent change	(13.50%)
Net income attributable to U.S. Bancorp	45	52
Net income attributable to U.S. Bancorp, percent change	(13.50%)
Average Balance Sheet
Commercial	1,122	1,019
Commercial, percent change	10.10%
Commercial real estate	570	590
Commercial real estate, percent change	(3.40%)
Residential mortgages	385	380
Residential mortgages, percent change	1.30%
Other retail	1,537	1,638
Other retail, percent change	(6.20%)
Total loans, excluding covered loans	3,614	3,627
Total loans excluding covered loans, percent change	(0.40%)
Covered loans	12	13
Covered loans, percent change	(7.70%)
Total loans	3,626	3,640
Total loans, percent change	(0.40%)
Goodwill	1,467	1,463
Goodwill, percent change	0.30%
Other intangible assets	176	197
Other intangible assets, percent change	(10.70%)
Assets	6,240	6,066
Assets, percent change	2.90%
Noninterest-bearing deposits	13,421	6,137
Interest checking	4,100	3,104
Interest checking, percent change	32.10%
Savings products	23,409	21,385
Savings products, percent change	9.50%
Time deposits	4,650	6,933
Time deposits, percent change	(32.90%)
Total deposits	45,580	37,559
Total deposits, percent change	21.40%
Total U.S. Bancorp shareholders' equity	2,201	2,076
Total U.S. Bancorp shareholders' equity, percent change	6.00%
Payment Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	396	332
Net interest income (taxable-equivalent basis), percent change	19.30%
Noninterest income	733	761
Noninterest income, percent change	(3.70%)
Securities gains (losses), net
Securities gains (losses), net, percent change
Total net revenue	1,129	1,093
Total net revenue, percent change	3.30%
Noninterest expense	454	417
Noninterest expense, percent change	8.90%
Other intangibles	44	43
Other intangibles, percent change	2.30%
Total noninterest expense	498	460
Total noninterest expense, percent change	8.30%
Income before provision and income taxes	631	633
Income before provision and income taxes, percent change	(0.30%)
Provision for credit losses	216	163
Provision for credit losses, percent change	32.50%
Income before income taxes	415	470
Income before income taxes, percent change	(11.70%)
Income taxes and taxable-equivalent adjustment	151	171
Income taxes and taxable-equivalent adjustment, percent change	(11.70%)
Net income	264	299
Net income, percent change	(11.70%)
Net (income) loss attributable to noncontrolling interests	(10)	(9)
Net income attributable to noncontrolling interests, percent change	(11.10%)
Net income attributable to U.S. Bancorp	254	290
Net income attributable to U.S. Bancorp, percent change	(12.40%)
Average Balance Sheet
Commercial	5,647	5,221
Commercial, percent change	8.20%
Credit card	16,778	16,124
Credit card, percent change	4.10%
Other retail	837	938
Other retail, percent change	(10.80%)
Total loans, excluding covered loans	23,262	22,283
Total loans excluding covered loans, percent change	4.40%
Covered loans	5	2
Total loans	23,267	22,285
Total loans, percent change	4.40%
Goodwill	2,350	2,356
Goodwill, percent change	(0.30%)
Other intangible assets	771	838
Other intangible assets, percent change	(8.00%)
Assets	29,752	27,223
Assets, percent change	9.30%
Noninterest-bearing deposits	660	686
Noninterest-bearing deposits, percent change	(3.80%)
Interest checking	1,305	164
Savings products	34	26
Savings products, percent change	30.80%
Total deposits	1,999	876
Total U.S. Bancorp shareholders' equity	5,729	5,295
Total U.S. Bancorp shareholders' equity, percent change	8.20%
Treasury and Corporate Support [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	495	440
Net interest income (taxable-equivalent basis), percent change	12.50%
Noninterest income	63	88
Noninterest income, percent change	(28.40%)
Securities gains (losses), net		(5)
Total net revenue	558	523
Total net revenue, percent change	6.70%
Noninterest expense	271	164
Noninterest expense, percent change	65.20%
Total noninterest expense	271	164
Total noninterest expense, percent change	65.20%
Income before provision and income taxes	287	359
Income before provision and income taxes, percent change	(20.10%)
Provision for credit losses	10	9
Provision for credit losses, percent change	11.10%
Income before income taxes	277	350
Income before income taxes, percent change	(20.90%)
Income taxes and taxable-equivalent adjustment	(3)	21
Net income	280	329
Net income, percent change	(14.90%)
Net (income) loss attributable to noncontrolling interests	43	25
Net income attributable to noncontrolling interests, percent change	72.00%
Net income attributable to U.S. Bancorp	323	354
Net income attributable to U.S. Bancorp, percent change	(8.80%)
Average Balance Sheet
Commercial	100	103
Commercial, percent change	(2.90%)
Commercial real estate	167	246
Commercial real estate, percent change	(32.10%)
Residential mortgages	7	5
Residential mortgages, percent change	40.00%
Other retail	1	2
Other retail, percent change	(50.00%)
Total loans, excluding covered loans	275	356
Total loans excluding covered loans, percent change	(22.80%)
Covered loans	5,392	6,881
Covered loans, percent change	(21.60%)
Total loans	5,667	7,237
Total loans, percent change	(21.70%)
Other intangible assets	4	6
Other intangible assets, percent change	(33.30%)
Assets	101,063	89,408
Assets, percent change	13.00%
Noninterest-bearing deposits	455	177
Interest checking	1	1
Savings products	129	154
Savings products, percent change	(16.20%)
Time deposits	158	466
Time deposits, percent change	(66.10%)
Total deposits	743	798
Total deposits, percent change	(6.90%)
Total U.S. Bancorp shareholders' equity	10,442	7,867
Total U.S. Bancorp shareholders' equity, percent change	32.70%
Consolidated company [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	2,690	2,507
Net interest income (taxable-equivalent basis), percent change	7.30%
Noninterest income	2,239	2,017
Noninterest income, percent change	11.00%
Securities gains (losses), net		(5)
Total net revenue	4,929	4,519
Total net revenue, percent change	9.10%
Noninterest expense	2,489	2,239
Noninterest expense, percent change	11.20%
Other intangibles	71	75
Other intangibles, percent change	(5.30%)
Total noninterest expense	2,560	2,314
Total noninterest expense, percent change	10.60%
Income before provision and income taxes	2,369	2,205
Income before provision and income taxes, percent change	7.40%
Provision for credit losses	481	755
Provision for credit losses, percent change	(36.30%)
Income before income taxes	1,888	1,450
Income before income taxes, percent change	30.20%
Income taxes and taxable-equivalent adjustment	583	421
Income taxes and taxable-equivalent adjustment, percent change	38.50%
Net income	1,305	1,029
Net income, percent change	26.80%
Net (income) loss attributable to noncontrolling interests	33	17
Net income attributable to noncontrolling interests, percent change	94.10%
Net income attributable to U.S. Bancorp	1,338	1,046
Net income attributable to U.S. Bancorp, percent change	27.90%
Average Balance Sheet
Commercial	57,131	48,713
Commercial, percent change	17.30%
Commercial real estate	35,985	35,179
Commercial real estate, percent change	2.30%
Residential mortgages	37,831	31,777
Residential mortgages, percent change	19.10%
Credit card	16,778	16,124
Credit card, percent change	4.10%
Other retail	47,930	48,139
Other retail, percent change	(0.40%)
Total loans, excluding covered loans	195,655	179,932
Total loans excluding covered loans, percent change	8.70%
Covered loans	14,506	17,638
Covered loans, percent change	(17.80%)
Total loans	210,161	197,570
Total loans, percent change	6.40%
Goodwill	8,936	8,959
Goodwill, percent change	(0.30%)
Other intangible assets	2,758	3,327
Other intangible assets, percent change	(17.10%)
Assets	336,287	307,896
Assets, percent change	9.20%
Noninterest-bearing deposits	63,583	44,189
Noninterest-bearing deposits, percent change	43.90%
Interest checking	47,458	42,645
Interest checking, percent change	11.30%
Savings products	74,773	70,979
Savings products, percent change	5.30%
Time deposits	42,470	46,492
Time deposits, percent change	(8.70%)
Total deposits	228,284	204,305
Total deposits, percent change	11.70%
Total U.S. Bancorp shareholders' equity	$ 35,415	$ 30,009
Total U.S. Bancorp shareholders' equity, percent change	18.00%