Business Segments - Business Segment Results (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Noninterest income	$ 2,396	$ 2,381
Provision for credit losses	112	(827)
Net income	1,558	2,285
Net (income) loss attributable to noncontrolling interests	(1)	(5)
Net income attributable to U.S. Bancorp	1,557	2,280
Corporate and Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	735	719
Noninterest income	245	268
Total income	980	987
Noninterest expense	419	409
Income (loss) before provision and income taxes	561	578
Provision for credit losses	3	(48)
Income (loss) before income taxes	558	626
Income taxes and taxable-equivalent adjustment	140	157
Net income	418	469
Net income attributable to U.S. Bancorp	418	469
Loans	115,634	101,927
Other earning assets	4,676	4,321
Goodwill	1,912	1,647
Other intangible assets	4	5
Assets	127,651	114,069
Noninterest-bearing deposits	62,285	56,281
Interest-bearing deposits	86,618	71,377
Total deposits	148,903	127,658
Total U.S. Bancorp shareholders' equity	13,710	14,354
Consumer and Business Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	1,517	1,505
Noninterest income	461	569
Total income	1,978	2,074
Noninterest expense	1,405	1,344
Income (loss) before provision and income taxes	573	730
Provision for credit losses	49	(37)
Income (loss) before income taxes	524	767
Income taxes and taxable-equivalent adjustment	131	192
Net income	393	575
Net income attributable to U.S. Bancorp	393	575
Loans	141,106	141,719
Other earning assets	4,381	10,177
Goodwill	3,261	3,475
Other intangible assets	3,176	2,493
Assets	157,696	164,131
Noninterest-bearing deposits	32,094	32,861
Interest-bearing deposits	166,765	151,406
Total deposits	198,859	184,267
Total U.S. Bancorp shareholders' equity	12,275	12,496
Wealth Management and Investment Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	274	268
Noninterest income	596	531
Total income	870	799
Noninterest expense	587	494
Income (loss) before provision and income taxes	283	305
Provision for credit losses	8	5
Income (loss) before income taxes	275	300
Income taxes and taxable-equivalent adjustment	69	75
Net income	206	225
Net income attributable to U.S. Bancorp	206	225
Loans	20,666	16,846
Other earning assets	259	279
Goodwill	1,761	1,619
Other intangible assets	265	42
Assets	24,446	20,120
Noninterest-bearing deposits	27,350	21,338
Interest-bearing deposits	69,909	83,474
Total deposits	97,259	104,812
Total U.S. Bancorp shareholders' equity	3,595	3,034
Payments Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	622	629
Noninterest income	858	785
Total income	1,480	1,414
Noninterest expense	854	805
Income (loss) before provision and income taxes	626	609
Provision for credit losses	130	(41)
Income (loss) before income taxes	496	650
Income taxes and taxable-equivalent adjustment	124	163
Net income	372	487
Net income attributable to U.S. Bancorp	372	487
Loans	31,740	29,630
Other earning assets	1,023	5
Goodwill	3,325	3,173
Other intangible assets	464	542
Assets	38,540	35,091
Noninterest-bearing deposits	3,673	5,264
Interest-bearing deposits	160	132
Total deposits	3,833	5,396
Total U.S. Bancorp shareholders' equity	8,019	7,658
Treasury and Corporate Support [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	52	(32)
Noninterest income	236	228
Total income	288	196
Noninterest expense	237	327
Income (loss) before provision and income taxes	51	(131)
Provision for credit losses	(78)	(706)
Income (loss) before income taxes	129	575
Income taxes and taxable-equivalent adjustment	(40)	46
Net income	169	529
Net (income) loss attributable to noncontrolling interests	(1)	(5)
Net income attributable to U.S. Bancorp	168	524
Loans	3,820	3,867
Other earning assets	206,532	188,940
Assets	229,069	215,323
Noninterest-bearing deposits	2,561	2,608
Interest-bearing deposits	2,761	1,623
Total deposits	5,322	4,231
Total U.S. Bancorp shareholders' equity	15,867	15,187
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	3,200	3,089
Noninterest income	2,396	2,381
Total income	5,596	5,470
Noninterest expense	3,502	3,379
Income (loss) before provision and income taxes	2,094	2,091
Provision for credit losses	112	(827)
Income (loss) before income taxes	1,982	2,918
Income taxes and taxable-equivalent adjustment	424	633
Net income	1,558	2,285
Net (income) loss attributable to noncontrolling interests	(1)	(5)
Net income attributable to U.S. Bancorp	1,557	2,280
Loans	312,966	293,989
Other earning assets	216,871	203,722
Goodwill	10,259	9,914
Other intangible assets	3,909	3,082
Assets	577,402	548,734
Noninterest-bearing deposits	127,963	118,352
Interest-bearing deposits	326,213	308,012
Total deposits	454,176	426,364
Total U.S. Bancorp shareholders' equity	$ 53,466	$ 52,729