Business Segments - Business Segment Results (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Noninterest income	$ 2,548	$ 2,619	$ 4,944	$ 5,000
Provision for credit losses	311	(170)	423	(997)
Net income	1,534	1,988	3,092	4,273
Net (income) loss attributable to noncontrolling interests	(3)	(6)	(4)	(11)
Net income attributable to U.S. Bancorp	1,531	1,982	3,088	4,262
Corporate and Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	784	726	1,523	1,448
Noninterest income	272	265	517	533
Total income	1,056	991	2,040	1,981
Noninterest expense	453	433	878	853
Income (loss) before provision and income taxes	603	558	1,162	1,128
Provision for credit losses	100	0	104	(46)
Income (loss) before income taxes	503	558	1,058	1,174
Income taxes and taxable-equivalent adjustment	126	140	265	294
Net income	377	418	793	880
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to U.S. Bancorp	377	418	793	880
Loans	123,210	102,275	119,557	102,201
Other earning assets	4,161	4,409	4,416	4,364
Goodwill	1,912	1,647	1,912	1,647
Other intangible assets	4	5	4	5
Assets	137,773	114,186	132,856	114,229
Noninterest-bearing deposits	58,266	60,696	60,298	58,524
Interest-bearing deposits	93,678	70,019	90,336	70,943
Total deposits	151,944	130,715	150,634	129,467
Total U.S. Bancorp shareholders' equity	13,989	13,816	13,859	14,092
Consumer and Business Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	1,617	1,534	3,129	3,035
Noninterest income	395	634	856	1,203
Total income	2,012	2,168	3,985	4,238
Noninterest expense	1,419	1,375	2,839	2,731
Income (loss) before provision and income taxes	593	793	1,146	1,507
Provision for credit losses	(75)	(68)	(28)	(108)
Income (loss) before income taxes	668	861	1,174	1,615
Income taxes and taxable-equivalent adjustment	167	215	294	404
Net income	501	646	880	1,211
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to U.S. Bancorp	501	646	880	1,211
Loans	141,135	140,826	140,984	141,170
Other earning assets	2,579	8,018	3,475	9,092
Goodwill	3,244	3,476	3,252	3,476
Other intangible assets	3,634	2,828	3,406	2,661
Assets	156,132	161,695	156,770	162,803
Noninterest-bearing deposits	31,642	33,702	31,807	33,244
Interest-bearing deposits	168,486	158,164	167,279	154,450
Total deposits	200,128	191,866	199,086	187,694
Total U.S. Bancorp shareholders' equity	12,366	12,337	12,311	12,407
Wealth Management and Investment Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	352	246	627	514
Noninterest income	652	549	1,248	1,080
Total income	1,004	795	1,875	1,594
Noninterest expense	581	521	1,174	1,020
Income (loss) before provision and income taxes	423	274	701	574
Provision for credit losses	(4)	(4)	4	1
Income (loss) before income taxes	427	278	697	573
Income taxes and taxable-equivalent adjustment	107	70	175	144
Net income	320	208	522	429
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to U.S. Bancorp	320	208	522	429
Loans	22,320	17,442	21,521	17,147
Other earning assets	251	237	255	258
Goodwill	1,718	1,618	1,739	1,618
Other intangible assets	300	84	283	63
Assets	25,786	20,470	25,124	20,297
Noninterest-bearing deposits	25,019	23,288	26,204	22,339
Interest-bearing deposits	71,759	73,347	71,024	78,489
Total deposits	96,778	96,635	97,228	100,828
Total U.S. Bancorp shareholders' equity	3,618	3,089	3,607	3,062
Payments Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	619	595	1,241	1,224
Noninterest income	994	913	1,852	1,698
Total income	1,613	1,508	3,093	2,922
Noninterest expense	871	829	1,726	1,627
Income (loss) before provision and income taxes	742	679	1,367	1,295
Provision for credit losses	221	91	351	50
Income (loss) before income taxes	521	588	1,016	1,245
Income taxes and taxable-equivalent adjustment	130	147	254	311
Net income	391	441	762	934
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income attributable to U.S. Bancorp	391	441	762	934
Loans	33,854	30,030	32,802	29,831
Other earning assets	1,023	5	1,023	5
Goodwill	3,318	3,176	3,322	3,175
Other intangible assets	438	518	450	530
Assets	41,054	35,618	39,803	35,356
Noninterest-bearing deposits	3,396	5,030	3,534	5,146
Interest-bearing deposits	167	141	164	137
Total deposits	3,563	5,171	3,698	5,283
Total U.S. Bancorp shareholders' equity	8,115	7,413	8,067	7,535
Treasury and Corporate Support [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	92	63	144	32
Noninterest income	235	258	471	486
Total income	327	321	615	518
Noninterest expense	400	229	609	535
Income (loss) before provision and income taxes	(73)	92	6	(17)
Provision for credit losses	69	(189)	(8)	(894)
Income (loss) before income taxes	(142)	281	14	877
Income taxes and taxable-equivalent adjustment	(87)	6	(121)	58
Net income	(55)	275	135	819
Net (income) loss attributable to noncontrolling interests	(3)	(6)	(4)	(11)
Net income attributable to U.S. Bancorp	(58)	269	131	808
Loans	3,668	3,711	3,744	3,789
Other earning assets	204,560	193,798	205,541	191,382
Goodwill	0	0	0	0
Other intangible assets	0	0	0	0
Assets	219,166	219,396	224,110	217,372
Noninterest-bearing deposits	2,504	2,581	2,532	2,591
Interest-bearing deposits	1,599	2,242	2,174	1,932
Total deposits	4,103	4,823	4,706	4,523
Total U.S. Bancorp shareholders' equity	11,078	16,307	13,460	15,750
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	3,464	3,164	6,664	6,253
Noninterest income	2,548	2,619	4,944	5,000
Total income	6,012	5,783	11,608	11,253
Noninterest expense	3,724	3,387	7,226	6,766
Income (loss) before provision and income taxes	2,288	2,396	4,382	4,487
Provision for credit losses	311	(170)	423	(997)
Income (loss) before income taxes	1,977	2,566	3,959	5,484
Income taxes and taxable-equivalent adjustment	443	578	867	1,211
Net income	1,534	1,988	3,092	4,273
Net (income) loss attributable to noncontrolling interests	(3)	(6)	(4)	(11)
Net income attributable to U.S. Bancorp	1,531	1,982	3,088	4,262
Loans	324,187	294,284	318,608	294,138
Other earning assets	212,574	206,467	214,710	205,101
Goodwill	10,192	9,917	10,225	9,916
Other intangible assets	4,376	3,435	4,143	3,259
Assets	579,911	551,365	578,663	550,057
Noninterest-bearing deposits	120,827	125,297	124,375	121,844
Interest-bearing deposits	335,689	303,913	330,977	305,951
Total deposits	456,516	429,210	455,352	427,795
Total U.S. Bancorp shareholders' equity	$ 49,166	$ 52,962	$ 51,304	$ 52,846