EQUITY, ROYALTY AND INTEREST INCOME FROM INVESTEES - Schedule of Equity, Royalty and Interest Income from Investees (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	$ 154	$ 118	$ 302	$ 249
Chongqing Cummins Engine Company, Ltd.
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	29	22	58	45
Dongfeng Cummins Engine Company, Ltd.
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	27	19	50	39
Beijing Foton Cummins Engine Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	22	15	43	30
Tata Cummins, Ltd.
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	8	7	20	17
All other manufacturers
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	19	14	35	21
Komatsu Cummins Chile, Ltda.
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	18	15	32	29
All other distributors
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	6	4	14	12
Cummins share of net income
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	129	96	252	193
Royalty and interest income
Schedule of Equity Method Investments [Line Items]
Equity, royalty and interest income (loss) from investees	$ 25	$ 22	$ 50	$ 56