Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Income Statement
Noninterest income	$ 2,355	$ 2,146	$ 4,594	$ 4,158
Securities gains (losses), net	(19)	(8)	(19)	(13)
Other intangibles	70	75	141	150
Total noninterest expense	2,601	2,425	5,161	4,739
Income before income taxes	1,942	1,637	3,774	3,032
Net income	1,378	1,179	2,683	2,208
Net (income) loss attributable to noncontrolling interests	37	24	70	41
Net income attributable to U.S. Bancorp	1,415	1,203	2,753	2,249
Wholesale Banking and Commercial Real Estate [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	520	531	1,054	1,044
Net interest income (taxable-equivalent basis), Percent change	(2.10%)		1.00%
Noninterest income	317	326	626	618
Noninterest income, Percent change	(2.80%)		1.30%
Securities gains (losses), net	0	0	0	0
Securities gain (losses), net, Percent change	0.00%		0.00%
Total net revenue	837	857	1,680	1,662
Total net revenue, Percent change	(2.30%)		1.10%
Noninterest expense	314	320	627	612
Noninterest expense, Percent change	(1.90%)		2.50%
Other intangibles	4	4	8	8
Other intangible, Percent change	0.00%		0.00%
Total noninterest expense	318	324	635	620
Total noninterest expense, Percent change	(1.90%)		2.40%
Income before provision and income taxes	519	533	1,045	1,042
Income before provision and income taxes, Percent change	(2.60%)		0.30%
Provision for credit losses	0	112	3	291
Provision for credit losses, Percent change			(99.00%)
Income before income taxes	519	421	1,042	751
Income before income taxes, Percent change	23.30%		38.70%
Income taxes and taxable-equivalent adjustment	189	153	379	274
Income taxes and taxable-equivalent adjustment, Percent change	23.50%		38.30%
Net income	330	268	663	477
Net income, Percent change	23.10%		39.00%
Net (income) loss attributable to noncontrolling interests	0	4	0	5
Net income attributable to U.S. Bancorp	330	272	663	482
Net income attributable to U.S. Bancorp, Percent change	21.30%		37.60%
Average Balance Sheet
Commercial	44,580	36,027	43,468	35,617
Commercial, Percent change	23.70%		22.00%
Commercial real estate	19,730	19,239	19,580	19,295
Commercial real estate, Percent change	2.60%		1.50%
Residential mortgages	63	66	64	69
Residential mortgages, Percent change	(4.50%)		(7.20%)
Credit card	0	0	0	0
Credit card, Percent change	0.00%		0.00%
Other retail	4	6	4	6
Other retail, Percent change	(33.30%)		(33.30%)
Total loans, excluding covered loans	64,377	55,338	63,116	54,987
Total loans, excluding covered loans, Percent change	16.30%		14.80%
Covered loans	1,077	1,597	1,103	1,725
Covered loans, Percent change	(32.60%)		(36.10%)
Total Loans	65,454	56,935	64,219	56,712
Total Loans, Percent change	15.00%		13.20%
Goodwill	1,604	1,604	1,604	1,604
Other intangible assets	38	55	40	57
Other intangible assets, Percent change	(30.90%)		(29.80%)
Assets	71,490	63,118	70,020	62,548
Assets, Percent change	13.30%		11.90%
Noninterest-bearing deposits	30,527	23,295	30,440	21,669
Noninterest-bearing deposits, Percent change	31.00%		40.50%
Interest checking	10,858	14,143	11,985	14,068
Interest checking, Percent change	(23.20%)		(14.80%)
Savings products	7,420	9,355	8,077	9,587
Savings products, Percent change	(20.70%)		(15.80%)
Time deposits	16,931	14,992	15,093	14,902
Time deposits, Percent change	12.90%		1.30%
Total deposits	65,736	61,785	65,595	60,226
Total deposits, Percent change	6.40%		8.90%
Total U.S. Bancorp shareholders' equity	6,336	5,494	6,305	5,499
Total U.S. Bancorp shareholders' equity, Percent change	15.30%		14.70%
Consumer and Small Business Banking [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	1,179	1,126	2,358	2,257
Net interest income (taxable-equivalent basis), Percent change	4.70%		4.50%
Noninterest income	904	681	1,769	1,287
Noninterest income, Percent change	32.70%		37.50%
Securities gains (losses), net	0	0	0	0
Securities gain (losses), net, Percent change	0.00%		0.00%
Total net revenue	2,083	1,807	4,127	3,544
Total net revenue, Percent change	15.30%		16.50%
Noninterest expense	1,199	1,122	2,372	2,229
Noninterest expense, Percent change	6.90%		6.40%
Other intangibles	13	19	26	38
Other intangible, Percent change	(31.60%)		(31.60%)
Total noninterest expense	1,212	1,141	2,398	2,267
Total noninterest expense, Percent change	6.20%		5.80%
Income before provision and income taxes	871	666	1,729	1,277
Income before provision and income taxes, Percent change	30.80%		35.40%
Provision for credit losses	276	367	529	767
Provision for credit losses, Percent change	(24.80%)		(31.00%)
Income before income taxes	595	299	1,200	510
Income before income taxes, Percent change	99.00%
Income taxes and taxable-equivalent adjustment	217	109	437	184
Income taxes and taxable-equivalent adjustment, Percent change	99.10%
Net income	378	190	763	326
Net income, Percent change	98.90%
Net (income) loss attributable to noncontrolling interests	0	(1)	0	(1)
Net income attributable to U.S. Bancorp	378	189	763	325
Average Balance Sheet
Commercial	8,084	7,223	7,990	7,186
Commercial, Percent change	11.90%		11.20%
Commercial real estate	16,080	15,576	15,994	15,357
Commercial real estate, Percent change	3.20%		4.10%
Residential mortgages	38,721	32,269	38,048	31,791
Residential mortgages, Percent change	20.00%		19.70%
Credit card	0	0	0	0
Credit card, Percent change	0.00%		0.00%
Other retail	45,540	45,457	45,546	45,506
Other retail, Percent change	0.20%		0.10%
Total loans, excluding covered loans	108,425	100,525	107,578	99,840
Total loans, excluding covered loans, Percent change	7.90%		7.80%
Covered loans	7,640	8,522	7,767	8,649
Covered loans, Percent change	(10.30%)		(10.20%)
Total Loans	116,065	109,047	115,345	108,489
Total Loans, Percent change	6.40%		6.30%
Goodwill	3,515	3,515	3,515	3,526
Percentage of Goodwill			(0.30%)
Other intangible assets	1,824	2,244	1,794	2,237
Other intangible assets, Percent change	(18.70%)		(19.80%)
Assets	132,719	121,523	131,705	122,373
Assets, Percent change	9.20%		7.60%
Noninterest-bearing deposits	19,343	17,825	19,029	17,500
Noninterest-bearing deposits, Percent change	8.50%		8.70%
Interest checking	29,867	26,114	29,402	25,749
Interest checking, Percent change	14.40%		14.20%
Savings products	43,284	40,524	42,870	40,061
Savings products, Percent change	6.80%		7.00%
Time deposits	24,284	24,630	24,346	24,458
Time deposits, Percent change	(1.40%)		(0.50%)
Total deposits	116,778	109,093	115,647	107,768
Total deposits, Percent change	7.00%		7.30%
Total U.S. Bancorp shareholders' equity	11,112	9,239	10,940	9,253
Total U.S. Bancorp shareholders' equity, Percent change	20.30%		18.20%
Wealth Management and Securities Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	83	82	177	169
Net interest income (taxable-equivalent basis), Percent change	1.20%		4.70%
Noninterest income	279	271	546	542
Noninterest income, Percent change	3.00%		0.70%
Securities gains (losses), net	0	0	0	0
Securities gain (losses), net, Percent change	0.00%		0.00%
Total net revenue	362	353	723	711
Total net revenue, Percent change	2.50%		1.70%
Noninterest expense	285	271	566	534
Noninterest expense, Percent change	5.20%		6.00%
Other intangibles	10	9	20	18
Other intangible, Percent change	11.10%		11.10%
Total noninterest expense	295	280	586	552
Total noninterest expense, Percent change	5.40%		6.20%
Income before provision and income taxes	67	73	137	159
Income before provision and income taxes, Percent change	(8.20%)		(13.80%)
Provision for credit losses	3	(1)	2	1
Income before income taxes	64	74	135	158
Income before income taxes, Percent change	(13.50%)		(14.60%)
Income taxes and taxable-equivalent adjustment	23	27	49	56
Income taxes and taxable-equivalent adjustment, Percent change	(14.80%)		(12.50%)
Net income	41	47	86	102
Net income, Percent change	(12.80%)		(15.70%)
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to noncontrolling interest, Percent change	0.00%		0.00%
Net income attributable to U.S. Bancorp	41	47	86	102
Net income attributable to U.S. Bancorp, Percent change	(12.80%)		(15.70%)
Average Balance Sheet
Commercial	1,239	1,080	1,182	1,051
Commercial, Percent change	14.70%		12.50%
Commercial real estate	589	580	579	585
Commercial real estate, Percent change	1.60%		(1.00%)
Residential mortgages	376	391	380	386
Residential mortgages, Percent change	(3.80%)		(1.60%)
Credit card	0	0	0	0
Credit card, Percent change	0.00%		0.00%
Other retail	1,542	1,571	1,539	1,604
Other retail, Percent change	(1.80%)		(4.10%)
Total loans, excluding covered loans	3,746	3,622	3,680	3,626
Total loans, excluding covered loans, Percent change	3.40%		1.50%
Covered loans	12	13	12	13
Covered loans, Percent change	(7.70%)		(7.70%)
Total Loans	3,758	3,635	3,692	3,639
Total Loans, Percent change	3.40%		1.50%
Goodwill	1,469	1,463	1,468	1,463
Percentage of Goodwill	0.40%		0.30%
Other intangible assets	175	188	176	192
Other intangible assets, Percent change	(6.90%)		(8.30%)
Assets	6,471	6,056	6,356	6,062
Assets, Percent change	6.90%		4.80%
Noninterest-bearing deposits	13,528	6,623	13,468	6,377
Interest checking	3,866	2,903	3,985	3,004
Interest checking, Percent change	33.20%		32.70%
Savings products	23,132	21,414	23,275	21,399
Savings products, Percent change	8.00%		8.80%
Time deposits	4,767	6,075	4,709	6,502
Time deposits, Percent change	(21.50%)		(27.60%)
Total deposits	45,293	37,015	45,437	37,282
Total deposits, Percent change	22.40%		21.90%
Total U.S. Bancorp shareholders' equity	2,223	2,079	2,212	2,077
Total U.S. Bancorp shareholders' equity, Percent change	6.90%		6.50%
Payment Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	376	327	772	660
Net interest income (taxable-equivalent basis), Percent change	15.00%		17.00%
Noninterest income	816	831	1,549	1,591
Noninterest income, Percent change	(1.80%)		(2.60%)
Securities gains (losses), net	0	0	0	0
Securities gain (losses), net, Percent change	0.00%		0.00%
Total net revenue	1,192	1,158	2,321	2,251
Total net revenue, Percent change	2.90%		3.10%
Noninterest expense	439	439	888	853
Noninterest expense, Percent change	0.00%		4.10%
Other intangibles	43	43	87	86
Other intangible, Percent change	0.00%		1.20%
Total noninterest expense	482	482	975	939
Total noninterest expense, Percent change	0.00%		3.80%
Income before provision and income taxes	710	676	1,346	1,312
Income before provision and income taxes, Percent change	5.00%		2.60%
Provision for credit losses	197	89	413	253
Provision for credit losses, Percent change			63.20%
Income before income taxes	513	587	933	1,059
Income before income taxes, Percent change	(12.60%)		(11.90%)
Income taxes and taxable-equivalent adjustment	187	214	340	386
Income taxes and taxable-equivalent adjustment, Percent change	(12.60%)		(11.90%)
Net income	326	373	593	673
Net income, Percent change	(12.60%)		(11.90%)
Net (income) loss attributable to noncontrolling interests	(10)	(10)	(20)	(19)
Net income attributable to noncontrolling interest, Percent change	0.00%		(5.30%)
Net income attributable to U.S. Bancorp	316	363	573	654
Net income attributable to U.S. Bancorp, Percent change	(12.90%)		(12.40%)
Average Balance Sheet
Commercial	6,001	5,627	5,824	5,425
Commercial, Percent change	6.60%		7.40%
Commercial real estate	0	0	0	0
Commercial real estate, Percent change	0.00%		0.00%
Residential mortgages	0	0	0	0
Residential mortgages, Percent change	0.00%		0.00%
Credit card	16,696	15,884	16,737	16,004
Credit card, Percent change	5.10%		4.60%
Other retail	814	905	825	922
Other retail, Percent change	(10.10%)		(10.50%)
Total loans, excluding covered loans	23,511	22,416	23,386	22,351
Total loans, excluding covered loans, Percent change	4.90%		4.60%
Covered loans	5	5	5	4
Covered loans, Percent change	0.00%		25.00%
Total Loans	23,516	22,421	23,391	22,355
Total Loans, Percent change	4.90%		4.60%
Goodwill	2,350	2,370	2,350	2,363
Percentage of Goodwill	(0.80%)		(0.60%)
Other intangible assets	734	807	753	822
Other intangible assets, Percent change	(9.00%)		(8.40%)
Assets	29,785	27,563	29,768	27,396
Assets, Percent change	8.10%		8.70%
Noninterest-bearing deposits	632	712	646	699
Noninterest-bearing deposits, Percent change	(11.20%)		(7.60%)
Interest checking	1,336	173	1,320	169
Savings products	37	29	36	28
Savings products, Percent change	27.60%		28.60%
Time deposits	0	0	0	0
Time deposits, Percent change	0.00%		0.00%
Total deposits	2,005	914	2,002	896
Total U.S. Bancorp shareholders' equity	5,663	5,245	5,696	5,270
Total U.S. Bancorp shareholders' equity, Percent change	8.00%		8.10%
Treasury and Corporate Support [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	555	478	1,042	921
Net interest income (taxable-equivalent basis), Percent change	16.10%		13.10%
Noninterest income	58	45	123	133
Noninterest income, Percent change	28.90%		(7.50%)
Securities gains (losses), net	(19)	(8)	(19)	(13)
Securities gain (losses), net, Percent change			(46.20%)
Total net revenue	594	515	1,146	1,041
Total net revenue, Percent change	15.30%		10.10%
Noninterest expense	294	198	567	361
Noninterest expense, Percent change	48.50%		57.10%
Other intangibles	0	0	0	0
Other intangible, Percent change	0.00%
Total noninterest expense	294	198	567	361
Total noninterest expense, Percent change	48.50%		57.10%
Income before provision and income taxes	300	317	579	680
Income before provision and income taxes, Percent change	(5.40%)		(14.90%)
Provision for credit losses	(6)	5	4	15
Provision for credit losses, Percent change			(73.30%)
Income before income taxes	306	312	575	665
Income before income taxes, Percent change	(1.90%)		(13.50%)
Income taxes and taxable-equivalent adjustment	3	11	(3)	35
Income taxes and taxable-equivalent adjustment, Percent change	(72.70%)
Net income	303	301	578	630
Net income, Percent change	0.70%		(8.30%)
Net (income) loss attributable to noncontrolling interests	47	31	90	56
Net income attributable to noncontrolling interest, Percent change	51.60%		60.70%
Net income attributable to U.S. Bancorp	350	332	668	686
Net income attributable to U.S. Bancorp, Percent change	5.40%		(2.60%)
Average Balance Sheet
Commercial	116	97	112	108
Commercial, Percent change	19.60%		3.70%
Commercial real estate	150	104	114	103
Commercial real estate, Percent change	44.20%		10.70%
Residential mortgages	6	8	6	12
Residential mortgages, Percent change	(25.00%)		(50.00%)
Credit card	0	0	0	0
Credit card, Percent change	0.00%		0.00%
Other retail	0	1	1	1
Other retail, Percent change			0.00%
Total loans, excluding covered loans	272	210	233	224
Total loans, excluding covered loans, Percent change	29.50%		4.00%
Covered loans	5,004	6,562	5,235	6,775
Covered loans, Percent change	(23.70%)		(22.70%)
Total Loans	5,276	6,772	5,468	6,999
Total Loans, Percent change	(22.10%)		(21.90%)
Goodwill	0	0	0	0
Other intangible assets	4	5	4	5
Other intangible assets, Percent change	(20.00%)		(20.00%)
Assets	99,964	94,350	100,509	91,887
Assets, Percent change	6.00%		9.40%
Noninterest-bearing deposits	501	266	474	222
Noninterest-bearing deposits, Percent change	88.30%
Interest checking	1	1	1	1
Interest checking, Percent change	0.00%		0.00%
Savings products	139	214	134	184
Savings products, Percent change	(35.00%)		(27.20%)
Time deposits	848	123	502	292
Time deposits, Percent change	0.00%		71.90%
Total deposits	1,489	604	1,111	699
Total deposits, Percent change			58.90%
Total U.S. Bancorp shareholders' equity	11,932	9,910	11,188	8,895
Total U.S. Bancorp shareholders' equity, Percent change	20.40%		25.80%
Consolidated Company [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	2,713	2,544	5,403	5,051
Net interest income (taxable-equivalent basis), Percent change	6.60%		7.00%
Noninterest income	2,374	2,154	4,613	4,171
Noninterest income, Percent change	10.20%		10.60%
Securities gains (losses), net	(19)	(8)	(19)	(13)
Securities gain (losses), net, Percent change			(46.20%)
Total net revenue	5,068	4,690	9,997	9,209
Total net revenue, Percent change	8.10%		8.60%
Noninterest expense	2,531	2,350	5,020	4,589
Noninterest expense, Percent change	7.70%		9.40%
Other intangibles	70	75	141	150
Other intangible, Percent change	(6.70%)		(6.00%)
Total noninterest expense	2,601	2,425	5,161	4,739
Total noninterest expense, Percent change	7.30%		8.90%
Income before provision and income taxes	2,467	2,265	4,836	4,470
Income before provision and income taxes, Percent change	8.90%		8.20%
Provision for credit losses	470	572	951	1,327
Provision for credit losses, Percent change	(17.80%)		(28.30%)
Income before income taxes	1,997	1,693	3,885	3,143
Income before income taxes, Percent change	18.00%		23.60%
Income taxes and taxable-equivalent adjustment	619	514	1,202	935
Income taxes and taxable-equivalent adjustment, Percent change	20.40%		28.60%
Net income	1,378	1,179	2,683	2,208
Net income, Percent change	16.90%		21.50%
Net (income) loss attributable to noncontrolling interests	37	24	70	41
Net income attributable to noncontrolling interest, Percent change	54.20%		70.70%
Net income attributable to U.S. Bancorp	1,415	1,203	2,753	2,249
Net income attributable to U.S. Bancorp, Percent change	17.60%		22.40%
Average Balance Sheet
Commercial	60,020	50,054	58,576	49,387
Commercial, Percent change	19.90%		18.60%
Commercial real estate	36,549	35,499	36,267	35,340
Commercial real estate, Percent change	3.00%		2.60%
Residential mortgages	39,166	32,734	38,498	32,258
Residential mortgages, Percent change	19.60%		19.30%
Credit card	16,696	15,884	16,737	16,004
Credit card, Percent change	5.10%		4.60%
Other retail	47,900	47,940	47,915	48,039
Other retail, Percent change	(0.10%)		(0.30%)
Total loans, excluding covered loans	200,331	182,111	197,993	181,028
Total loans, excluding covered loans, Percent change	10.00%		9.40%
Covered loans	13,738	16,699	14,122	17,166
Covered loans, Percent change	(17.70%)		(17.70%)
Total Loans	214,069	198,810	212,115	198,194
Total Loans, Percent change	7.70%		7.00%
Goodwill	8,938	8,952	8,937	8,956
Percentage of Goodwill	(0.20%)		(0.20%)
Other intangible assets	2,775	3,299	2,767	3,313
Other intangible assets, Percent change	(15.90%)		(16.50%)
Assets	340,429	312,610	338,358	310,266
Assets, Percent change	8.90%		9.10%
Noninterest-bearing deposits	64,531	48,721	64,057	46,467
Noninterest-bearing deposits, Percent change	32.50%		37.90%
Interest checking	45,928	43,334	46,693	42,991
Interest checking, Percent change	6.00%		8.60%
Savings products	74,012	71,536	74,392	71,259
Savings products, Percent change	3.50%		4.40%
Time deposits	46,830	45,820	44,650	46,154
Time deposits, Percent change	2.20%		(3.30%)
Total deposits	231,301	209,411	229,792	206,871
Total deposits, Percent change	10.50%		11.10%
Total U.S. Bancorp shareholders' equity	$ 37,266	$ 31,967	$ 36,341	$ 30,994
Total U.S. Bancorp shareholders' equity, Percent change	16.60%		17.30%