Business Segments - Business Segment Results (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	$ 4,268	$ 3,857	$ 13,385	$ 10,521
Noninterest income	2,764	2,469	7,997	7,413
Total net revenue	7,032	6,326	21,382	17,934
Noninterest expense	4,530	3,637	13,654	10,863
Income (loss) before provision and income taxes	2,502	2,689	7,728	7,071
Provision for credit losses	515	362	1,763	785
Income (loss) before income taxes	1,987	2,327	5,965	6,286
Income taxes and taxable-equivalent adjustment	463	511	1,368	1,378
Net income (loss)	1,524	1,816	4,597	4,908
Net (income) loss attributable to noncontrolling interests	(1)	(4)	(15)	(8)
Net income (loss) attributable to U.S. Bancorp	1,523	1,812	4,582	4,900
Loans	376,877	336,778	384,112	324,731
Other earning assets	228,368	204,888	224,779	211,400
Goodwill	12,486	10,145	12,474	10,198
Other intangible assets	6,425	4,445	6,730	4,245
Assets	663,999	588,764	667,481	582,067
Noninterest-bearing deposits	97,524	114,044	113,556	120,893
Interest-bearing deposits	414,767	342,725	393,077	334,936
Total deposits	512,291	456,769	506,633	455,829
Total U.S. Bancorp shareholders' equity	53,817	49,820	53,440	50,804
Wealth, Corporate, Commercial and Institutional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	1,472	1,439	4,691	3,650
Noninterest income	1,031	906	3,122	2,672
Total net revenue	2,503	2,345	7,813	6,322
Noninterest expense	1,258	1,014	3,844	3,020
Income (loss) before provision and income taxes	1,245	1,331	3,969	3,302
Provision for credit losses	128	71	264	180
Income (loss) before income taxes	1,117	1,260	3,705	3,122
Income taxes and taxable-equivalent adjustment	279	315	927	781
Net income (loss)	838	945	2,778	2,341
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	838	945	2,778	2,341
Loans	175,579	154,473	177,081	145,594
Other earning assets	6,458	4,737	6,386	4,682
Goodwill	4,638	3,612	4,634	3,638
Other intangible assets	921	314	972	295
Assets	203,784	174,077	203,358	163,392
Noninterest-bearing deposits	66,083	77,471	74,003	84,200
Interest-bearing deposits	206,622	178,080	198,702	169,892
Total deposits	272,705	255,551	272,705	254,092
Total U.S. Bancorp shareholders' equity	22,831	18,334	22,246	17,758
Consumer and Business Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	2,045	1,693	6,413	4,752
Noninterest income	430	332	1,256	1,177
Total net revenue	2,475	2,025	7,669	5,929
Noninterest expense	1,734	1,405	5,295	4,210
Income (loss) before provision and income taxes	741	620	2,374	1,719
Provision for credit losses	8	41	30	15
Income (loss) before income taxes	733	579	2,344	1,704
Income taxes and taxable-equivalent adjustment	183	145	586	426
Net income (loss)	550	434	1,758	1,278
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	550	434	1,758	1,278
Loans	157,357	142,640	163,905	141,276
Other earning assets	2,688	3,043	2,462	3,330
Goodwill	4,515	3,241	4,512	3,248
Other intangible assets	5,154	3,726	5,378	3,515
Assets	174,788	158,057	181,595	156,904
Noninterest-bearing deposits	25,590	30,829	33,638	30,722
Interest-bearing deposits	196,374	161,778	185,476	162,528
Total deposits	221,964	192,607	219,114	193,250
Total U.S. Bancorp shareholders' equity	15,763	12,431	16,236	12,324
Payments Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	692	629	1,991	1,870
Noninterest income	1,039	994	3,027	2,844
Total net revenue	1,731	1,623	5,018	4,714
Noninterest expense	967	892	2,795	2,601
Income (loss) before provision and income taxes	764	731	2,223	2,113
Provision for credit losses	399	285	933	636
Income (loss) before income taxes	365	446	1,290	1,477
Income taxes and taxable-equivalent adjustment	91	112	322	370
Net income (loss)	274	334	968	1,107
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	274	334	968	1,107
Loans	38,954	35,819	37,942	33,820
Other earning assets	5	392	126	810
Goodwill	3,333	3,292	3,328	3,312
Other intangible assets	339	405	361	435
Assets	44,774	42,053	43,928	40,536
Noninterest-bearing deposits	2,796	3,312	3,052	3,459
Interest-bearing deposits	101	171	104	166
Total deposits	2,897	3,483	3,156	3,625
Total U.S. Bancorp shareholders' equity	9,442	8,255	9,181	8,129
Treasury and Corporate Support [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	59	96	290	249
Noninterest income	264	237	592	720
Total net revenue	323	333	882	969
Noninterest expense	571	326	1,720	1,032
Income (loss) before provision and income taxes	(248)	7	(838)	(63)
Provision for credit losses	(20)	(35)	536	(46)
Income (loss) before income taxes	(228)	42	(1,374)	(17)
Income taxes and taxable-equivalent adjustment	(90)	(61)	(467)	(199)
Net income (loss)	(138)	103	(907)	182
Net (income) loss attributable to noncontrolling interests	(1)	(4)	(15)	(8)
Net income (loss) attributable to U.S. Bancorp	(139)	99	(922)	174
Loans	4,987	3,846	5,184	4,041
Other earning assets	219,217	196,716	215,805	202,578
Goodwill	0	0	0	0
Other intangible assets	11	0	19	0
Assets	240,653	214,577	238,600	221,235
Noninterest-bearing deposits	3,055	2,432	2,863	2,512
Interest-bearing deposits	11,670	2,696	8,795	2,350
Total deposits	14,725	5,128	11,658	4,862
Total U.S. Bancorp shareholders' equity	$ 5,781	$ 10,800	$ 5,777	$ 12,593