Basis of Presentation - Line of Business Financial Performance (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Income Statement
Net interest income (taxable-equivalent basis)	$ 2,706	$ 2,709
Net interest income (taxable-equivalent basis), Percent change	(0.10%)
Noninterest income	2,103	2,160
Noninterest income, Percent change	(2.60%)
Securities gains (losses), net	5	5
Securities gains (losses), net, Percent change
Total net revenue	4,814	4,874
Total net revenue, Percent change	(1.20%)
Noninterest expense, Percent change	3.40%
Other intangibles, Percent change	(14.00%)
Total noninterest expense, Percent change	3.00%
Income before provision and income taxes, Percent change	(5.60%)
Provision for credit losses, Percent change	(24.10%)
Income before income taxes, Percent change	(1.80%)
Income taxes and taxable-equivalent adjustment, Percent change	(10.10%)
Net income, Percent change	1.80%
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	(2.20%)
Noninterest expense	2,495	2,413
Other intangibles	49	57
Total noninterest expense	2,544	2,470
Income before provision and income taxes	2,270	2,404
Provision for credit losses	306	403
Income before income taxes	1,964	2,001
Income taxes and taxable-equivalent adjustment	552	614
Net income	1,412	1,387
Net (income) loss attributable to noncontrolling interests	(15)	41
Net income attributable to U.S. Bancorp	1,397	1,428
Average Balance Sheet
Commercial	70,834	65,299
Commercial, Percent change	8.50%
Commercial real estate	40,050	37,218
Commercial real estate, Percent change	7.60%
Residential mortgages	51,584	45,109
Residential mortgages, Percent change	14.40%
Credit card	17,407	16,528
Credit card, Percent change	5.30%
Other retail	47,657	47,246
Other retail, Percent change	0.90%
Total loans, excluding covered loans	227,532	211,400
Total loans, excluding covered loans, Percent change	7.60%
Covered loans	8,327	11,021
Covered loans, Percent change	(24.40%)
Total loans	235,859	222,421
Total loans, Percent change	6.00%
Goodwill, Percent change	0.50%
Other intangible assets, Percent change	21.20%
Assets, Percent change	3.70%
Noninterest-bearing deposits, Percent change	6.70%
Interest checking, Percent change	6.00%
Savings products, Percent change	9.40%
Time deposits, Percent change	(6.10%)
Total deposits, Percent change	5.10%
Total U.S. Bancorp shareholders' equity, Percent change	6.60%
Goodwill	9,203	9,155
Other intangible assets	3,441	2,838
Assets	364,312	351,387
Noninterest-bearing deposits	70,824	66,400
Interest checking	51,305	48,404
Savings products	92,444	84,505
Time deposits	42,906	45,709
Total deposits	257,479	245,018
Total U.S. Bancorp shareholders' equity	41,761	39,177
Wholesale Banking and Commercial Real Estate [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	490	494
Net interest income (taxable-equivalent basis), Percent change	(0.80%)
Noninterest income	246	280
Noninterest income, Percent change	(12.10%)
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	736	774
Total net revenue, Percent change	(4.90%)
Noninterest expense, Percent change	(1.60%)
Other intangibles, Percent change	(50.00%)
Total noninterest expense, Percent change	(1.90%)
Income before provision and income taxes, Percent change	(6.90%)
Provision for credit losses, Percent change	50.00%
Income before income taxes, Percent change	(10.00%)
Income taxes and taxable-equivalent adjustment, Percent change	(10.40%)
Net income, Percent change	(9.70%)
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	(9.70%)
Noninterest expense	301	306
Other intangibles	1	2
Total noninterest expense	302	308
Income before provision and income taxes	434	466
Provision for credit losses	(18)	(36)
Income before income taxes	452	502
Income taxes and taxable-equivalent adjustment	164	183
Net income	288	319
Net (income) loss attributable to noncontrolling interests
Net income attributable to U.S. Bancorp	288	319
Average Balance Sheet
Commercial	54,491	49,133
Commercial, Percent change	10.90%
Commercial real estate	20,566	18,988
Commercial real estate, Percent change	8.30%
Residential mortgages	22	29
Residential mortgages, Percent change	(24.10%)
Credit card
Credit card, Percent change
Other retail	4	8
Other retail, Percent change	(50.00%)
Total loans, excluding covered loans	75,083	68,158
Total loans, excluding covered loans, Percent change	10.20%
Covered loans	245	466
Covered loans, Percent change	(47.40%)
Total loans	75,328	68,624
Total loans, Percent change	9.80%
Goodwill, Percent change
Other intangible assets, Percent change	(22.20%)
Assets, Percent change	10.10%
Noninterest-bearing deposits, Percent change	7.70%
Interest checking, Percent change	(3.80%)
Savings products, Percent change	43.90%
Time deposits, Percent change	11.60%
Total deposits, Percent change	13.10%
Total U.S. Bancorp shareholders' equity, Percent change	5.30%
Goodwill	1,604	1,604
Other intangible assets	21	27
Assets	82,249	74,720
Noninterest-bearing deposits	32,218	29,908
Interest checking	10,472	10,886
Savings products	17,128	11,902
Time deposits	18,385	16,472
Total deposits	78,203	69,168
Total U.S. Bancorp shareholders' equity	7,527	7,150
Consumer and Small Business Banking [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	1,090	1,163
Net interest income (taxable-equivalent basis), Percent change	(6.30%)
Noninterest income	625	787
Noninterest income, Percent change	(20.60%)
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	1,715	1,950
Total net revenue, Percent change	(12.10%)
Noninterest expense, Percent change	(1.40%)
Other intangibles, Percent change	(27.30%)
Total noninterest expense, Percent change	(1.70%)
Income before provision and income taxes, Percent change	(26.80%)
Provision for credit losses, Percent change	(41.70%)
Income before income taxes, Percent change	(20.90%)
Income taxes and taxable-equivalent adjustment, Percent change	(20.90%)
Net income, Percent change	(20.90%)
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	(20.90%)
Noninterest expense	1,116	1,132
Other intangibles	8	11
Total noninterest expense	1,124	1,143
Income before provision and income taxes	591	807
Provision for credit losses	133	228
Income before income taxes	458	579
Income taxes and taxable-equivalent adjustment	167	211
Net income	291	368
Net (income) loss attributable to noncontrolling interests
Net income attributable to U.S. Bancorp	291	368
Average Balance Sheet
Commercial	8,333	8,499
Commercial, Percent change	(2.00%)
Commercial real estate	18,623	17,463
Commercial real estate, Percent change	6.60%
Residential mortgages	50,296	44,499
Residential mortgages, Percent change	13.00%
Credit card
Credit card, Percent change
Other retail	45,484	44,922
Other retail, Percent change	1.30%
Total loans, excluding covered loans	122,736	115,383
Total loans, excluding covered loans, Percent change	6.40%
Covered loans	6,048	6,928
Covered loans, Percent change	(12.70%)
Total loans	128,784	122,311
Total loans, Percent change	5.30%
Goodwill, Percent change
Other intangible assets, Percent change	36.00%
Assets, Percent change	1.00%
Noninterest-bearing deposits, Percent change	2.80%
Interest checking, Percent change	7.60%
Savings products, Percent change	5.50%
Time deposits, Percent change	(16.60%)
Total deposits, Percent change	1.50%
Total U.S. Bancorp shareholders' equity, Percent change	(3.90%)
Goodwill	3,515	3,515
Other intangible assets	2,741	2,015
Assets	141,694	140,229
Noninterest-bearing deposits	21,945	21,352
Interest checking	34,851	32,386
Savings products	48,060	45,570
Time deposits	18,708	22,444
Total deposits	123,564	121,752
Total U.S. Bancorp shareholders' equity	11,569	12,040
Wealth Management and Securities Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	83	88
Net interest income (taxable-equivalent basis), Percent change	(5.70%)
Noninterest income	330	294
Noninterest income, Percent change	12.20%
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	413	382
Total net revenue, Percent change	8.10%
Noninterest expense, Percent change	3.80%
Other intangibles, Percent change
Total noninterest expense, Percent change	3.60%
Income before provision and income taxes, Percent change	35.80%
Provision for credit losses, Percent change
Income before income taxes, Percent change	43.40%
Income taxes and taxable-equivalent adjustment, Percent change	47.40%
Net income, Percent change	41.20%
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	41.20%
Noninterest expense	332	320
Other intangibles	9	9
Total noninterest expense	341	329
Income before provision and income taxes	72	53
Provision for credit losses	(4)
Income before income taxes	76	53
Income taxes and taxable-equivalent adjustment	28	19
Net income	48	34
Net (income) loss attributable to noncontrolling interests
Net income attributable to U.S. Bancorp	48	34
Average Balance Sheet
Commercial	1,842	1,617
Commercial, Percent change	13.90%
Commercial real estate	616	655
Commercial real estate, Percent change	(6.00%)
Residential mortgages	1,265	580
Residential mortgages, Percent change
Credit card
Credit card, Percent change
Other retail	1,472	1,553
Other retail, Percent change	(5.20%)
Total loans, excluding covered loans	5,195	4,405
Total loans, excluding covered loans, Percent change	17.90%
Covered loans	7	9
Covered loans, Percent change	(22.20%)
Total loans	5,202	4,414
Total loans, Percent change	17.90%
Goodwill, Percent change	2.40%
Other intangible assets, Percent change	(6.00%)
Assets, Percent change	12.80%
Noninterest-bearing deposits, Percent change	4.30%
Interest checking, Percent change	15.70%
Savings products, Percent change	0.70%
Time deposits, Percent change	(30.10%)
Total deposits, Percent change	(0.50%)
Total U.S. Bancorp shareholders' equity, Percent change	(2.70%)
Goodwill	1,565	1,528
Other intangible assets	171	182
Assets	8,217	7,286
Noninterest-bearing deposits	14,713	14,106
Interest checking	5,441	4,701
Savings products	27,084	26,890
Time deposits	4,165	5,961
Total deposits	51,403	51,658
Total U.S. Bancorp shareholders' equity	2,296	2,359
Payment Services [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	414	388
Net interest income (taxable-equivalent basis), Percent change	6.70%
Noninterest income	775	747
Noninterest income, Percent change	3.70%
Securities gains (losses), net
Securities gains (losses), net, Percent change
Total net revenue	1,189	1,135
Total net revenue, Percent change	4.80%
Noninterest expense, Percent change	4.70%
Other intangibles, Percent change	(11.40%)
Total noninterest expense, Percent change	3.80%
Income before provision and income taxes, Percent change	5.80%
Provision for credit losses, Percent change	(2.00%)
Income before income taxes, Percent change	10.50%
Income taxes and taxable-equivalent adjustment, Percent change	10.40%
Net income, Percent change	10.50%
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	11.00%
Noninterest expense	577	551
Other intangibles	31	35
Total noninterest expense	608	586
Income before provision and income taxes	581	549
Provision for credit losses	201	205
Income before income taxes	380	344
Income taxes and taxable-equivalent adjustment	138	125
Net income	242	219
Net (income) loss attributable to noncontrolling interests	(9)	(9)
Net income attributable to U.S. Bancorp	233	210
Average Balance Sheet
Commercial	5,997	5,860
Commercial, Percent change	2.30%
Commercial real estate
Commercial real estate, Percent change
Residential mortgages
Residential mortgages, Percent change
Credit card	17,407	16,528
Credit card, Percent change	5.30%
Other retail	697	763
Other retail, Percent change	(8.70%)
Total loans, excluding covered loans	24,101	23,151
Total loans, excluding covered loans, Percent change	4.10%
Covered loans	5	5
Covered loans, Percent change
Total loans	24,106	23,156
Total loans, Percent change	4.10%
Goodwill, Percent change	0.40%
Other intangible assets, Percent change	(17.20%)
Assets, Percent change	3.20%
Noninterest-bearing deposits, Percent change	0.90%
Interest checking, Percent change	25.60%
Savings products, Percent change	48.90%
Time deposits, Percent change
Total deposits, Percent change	11.90%
Total U.S. Bancorp shareholders' equity, Percent change	(4.90%)
Goodwill	2,519	2,508
Other intangible assets	507	612
Assets	30,372	29,444
Noninterest-bearing deposits	698	692
Interest checking	540	430
Savings products	70	47
Time deposits
Total deposits	1,308	1,169
Total U.S. Bancorp shareholders' equity	5,669	5,961
Treasury and Corporate Support [Member]
Condensed Income Statement
Net interest income (taxable-equivalent basis)	629	576
Net interest income (taxable-equivalent basis), Percent change	9.20%
Noninterest income	127	52
Noninterest income, Percent change
Securities gains (losses), net	5	5
Securities gains (losses), net, Percent change
Total net revenue	761	633
Total net revenue, Percent change	20.20%
Noninterest expense, Percent change	62.50%
Other intangibles, Percent change
Total noninterest expense, Percent change	62.50%
Income before provision and income taxes, Percent change	11.90%
Provision for credit losses, Percent change
Income before income taxes, Percent change	14.30%
Income taxes and taxable-equivalent adjustment, Percent change	(27.60%)
Net income, Percent change	21.50%
Net (income) loss attributable to noncontrolling interests, Percent change
Net income attributable to U.S. Bancorp, Percent change	8.00%
Noninterest expense	169	104
Total noninterest expense	169	104
Income before provision and income taxes	592	529
Provision for credit losses	(6)	6
Income before income taxes	598	523
Income taxes and taxable-equivalent adjustment	55	76
Net income	543	447
Net (income) loss attributable to noncontrolling interests	(6)	50
Net income attributable to U.S. Bancorp	537	497
Average Balance Sheet
Commercial	171	190
Commercial, Percent change	(10.00%)
Commercial real estate	245	112
Commercial real estate, Percent change
Residential mortgages	1	1
Residential mortgages, Percent change
Credit card
Credit card, Percent change
Other retail
Other retail, Percent change
Total loans, excluding covered loans	417	303
Total loans, excluding covered loans, Percent change	37.60%
Covered loans	2,022	3,613
Covered loans, Percent change	(44.00%)
Total loans	2,439	3,916
Total loans, Percent change	(37.70%)
Goodwill, Percent change
Other intangible assets, Percent change	(50.00%)
Assets, Percent change	2.10%
Noninterest-bearing deposits, Percent change
Interest checking, Percent change
Savings products, Percent change	6.30%
Time deposits, Percent change	98.10%
Total deposits, Percent change
Total U.S. Bancorp shareholders' equity, Percent change	26.00%
Goodwill
Other intangible assets	1	2
Assets	101,780	99,708
Noninterest-bearing deposits	1,250	342
Interest checking	1	1
Savings products	102	96
Time deposits	1,648	832
Total deposits	3,001	1,271
Total U.S. Bancorp shareholders' equity	$ 14,700	$ 11,667