Business Segments - Business Segment Results (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Noninterest income	$ 2,726	$ 2,548	$ 5,233	$ 4,944
Provision for credit losses	821	311	1,248	423
Net income (loss)	1,369	1,534	3,073	3,092
Net (income) loss attributable to noncontrolling interests	(8)	(3)	(14)	(4)
Net income (loss) attributable to U.S. Bancorp	1,361	1,531	3,059	3,088
Corporate and Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	1,019	799	2,099	1,546
Noninterest income	347	272	666	519
Total income	1,366	1,071	2,765	2,065
Noninterest expense	636	471	1,249	915
Income (loss) before provision and income taxes	730	600	1,516	1,150
Provision for credit losses	150	98	126	104
Income (loss) before income taxes	580	502	1,390	1,046
Income taxes and taxable-equivalent adjustment	145	126	348	262
Net income (loss)	435	376	1,042	784
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	435	376	1,042	784
Loans	151,123	123,245	150,455	119,598
Other earning assets	6,250	4,161	5,949	4,417
Goodwill	2,859	1,912	2,842	1,912
Other intangible assets	537	4	564	4
Assets	173,101	137,809	171,389	132,899
Noninterest-bearing deposits	51,242	59,226	54,808	61,195
Interest-bearing deposits	107,724	93,830	106,326	90,509
Total deposits	158,966	153,056	161,134	151,704
Total U.S. Bancorp shareholders' equity	18,244	13,992	17,776	13,862
Consumer and Business Banking [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	2,196	1,580	4,480	3,063
Noninterest income	426	390	823	844
Total income	2,622	1,970	5,303	3,907
Noninterest expense	1,801	1,401	3,568	2,807
Income (loss) before provision and income taxes	821	569	1,735	1,100
Provision for credit losses	24	(74)	31	(26)
Income (loss) before income taxes	797	643	1,704	1,126
Income taxes and taxable-equivalent adjustment	199	160	426	280
Net income (loss)	598	483	1,278	846
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	598	483	1,278	846
Loans	169,704	140,747	169,898	140,586
Other earning assets	2,512	2,576	2,346	3,475
Goodwill	4,531	3,244	4,511	3,253
Other intangible assets	5,393	3,635	5,493	3,406
Assets	187,507	155,700	187,715	156,320
Noninterest-bearing deposits	35,489	30,492	39,331	30,721
Interest-bearing deposits	187,793	164,269	184,632	163,123
Total deposits	223,282	194,761	223,963	193,844
Total U.S. Bancorp shareholders' equity	16,516	12,326	16,608	12,270
Wealth Management and Investment Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	482	370	999	662
Noninterest income	728	652	1,429	1,247
Total income	1,210	1,022	2,428	1,909
Noninterest expense	670	539	1,335	1,092
Income (loss) before provision and income taxes	540	483	1,093	817
Provision for credit losses	3	(4)	0	4
Income (loss) before income taxes	537	487	1,093	813
Income taxes and taxable-equivalent adjustment	134	122	273	204
Net income (loss)	403	365	820	609
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	403	365	820	609
Loans	24,568	22,285	24,441	21,483
Other earning assets	421	233	401	237
Goodwill	1,792	1,718	1,790	1,739
Other intangible assets	426	300	434	283
Assets	29,008	25,728	28,808	25,062
Noninterest-bearing deposits	21,199	25,194	21,619	26,378
Interest-bearing deposits	80,061	75,824	83,656	75,007
Total deposits	101,260	101,018	105,275	101,385
Total U.S. Bancorp shareholders' equity	3,976	3,615	4,040	3,604
Payments Services [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	645	619	1,299	1,241
Noninterest income	1,051	993	1,988	1,850
Total income	1,696	1,612	3,287	3,091
Noninterest expense	915	865	1,828	1,711
Income (loss) before provision and income taxes	781	747	1,459	1,380
Provision for credit losses	314	221	534	351
Income (loss) before income taxes	467	526	925	1,029
Income taxes and taxable-equivalent adjustment	117	132	232	258
Net income (loss)	350	394	693	771
Net (income) loss attributable to noncontrolling interests	0	0	0	0
Net income (loss) attributable to U.S. Bancorp	350	394	693	771
Loans	37,913	33,854	37,426	32,802
Other earning assets	74	1,023	187	1,023
Goodwill	3,330	3,318	3,325	3,321
Other intangible assets	359	437	372	450
Assets	44,127	41,014	43,493	39,762
Noninterest-bearing deposits	3,179	3,396	3,181	3,534
Interest-bearing deposits	104	167	106	164
Total deposits	3,283	3,563	3,287	3,698
Total U.S. Bancorp shareholders' equity	9,127	8,113	9,048	8,065
Treasury and Corporate Support [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	107	96	240	152
Noninterest income	174	241	327	484
Total income	281	337	567	636
Noninterest expense	547	448	1,144	701
Income (loss) before provision and income taxes	(266)	(111)	(577)	(65)
Provision for credit losses	330	70	557	(10)
Income (loss) before income taxes	(596)	(181)	(1,134)	(55)
Income taxes and taxable-equivalent adjustment	(179)	(97)	(374)	(137)
Net income (loss)	(417)	(84)	(760)	82
Net (income) loss attributable to noncontrolling interests	(8)	(3)	(14)	(4)
Net income (loss) attributable to U.S. Bancorp	(425)	(87)	(774)	78
Loans	5,509	4,056	5,569	4,139
Other earning assets	215,765	204,581	214,072	205,558
Goodwill	0	0	0	0
Other intangible assets	9	0	22	0
Assets	239,269	219,660	237,846	224,620
Noninterest-bearing deposits	2,649	2,519	2,766	2,547
Interest-bearing deposits	7,825	1,599	7,333	2,174
Total deposits	10,474	4,118	10,099	4,721
Total U.S. Bancorp shareholders' equity	5,959	11,120	5,776	13,503
Consolidated Company [Member]
Segment Reporting Information [Line Items]
Net interest income (taxable-equivalent basis)	4,449	3,464	9,117	6,664
Noninterest income	2,726	2,548	5,233	4,944
Total income	7,175	6,012	14,350	11,608
Noninterest expense	4,569	3,724	9,124	7,226
Income (loss) before provision and income taxes	2,606	2,288	5,226	4,382
Provision for credit losses	821	311	1,248	423
Income (loss) before income taxes	1,785	1,977	3,978	3,959
Income taxes and taxable-equivalent adjustment	416	443	905	867
Net income (loss)	1,369	1,534	3,073	3,092
Net (income) loss attributable to noncontrolling interests	(8)	(3)	(14)	(4)
Net income (loss) attributable to U.S. Bancorp	1,361	1,531	3,059	3,088
Loans	388,817	324,187	387,789	318,608
Other earning assets	225,022	212,574	222,955	214,710
Goodwill	12,512	10,192	12,468	10,225
Other intangible assets	6,724	4,376	6,885	4,143
Assets	673,012	579,911	669,251	578,663
Noninterest-bearing deposits	113,758	120,827	121,705	124,375
Interest-bearing deposits	383,507	335,689	382,053	330,977
Total deposits	497,265	456,516	503,758	455,352
Total U.S. Bancorp shareholders' equity	$ 53,822	$ 49,166	$ 53,248	$ 51,304