BORROWINGS - Narrative (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($) series	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Principal debt issued		$ 10,292,000,000	$ 9,452,000,000
Guarantor obligations, maximum exposure			114,000,000
Guarantee obligation, carrying value		3,000,000	4,000,000
Commercial contracts
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure		801,000,000	751,000,000
Equipment residual value obligation
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure		28,000,000	39,000,000
Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Line of credit outstanding		0	0
Senior unsecured notes | Senior notes
Debt Instrument [Line Items]
Debt, principal amount		$ 9,250,000,000
Number of debt series | series		7
Debt repayments		$ 0
4.800% senior notes due August 14, 2029 | Senior notes
Debt Instrument [Line Items]
Debt, principal amount		$ 1,000,000,000
Stated interest rate		4.80%
Principal debt issued		$ 1,000,000,000	$ 0
5-Year Revolving Credit Facility | Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Debt, term		5 years	5 years
Maximum borrowing capacity		$ 2,500,000,000
364-Day Revolving Credit Facility | Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Debt, term		364 days	364 days
Maximum borrowing capacity		$ 1,000,000,000
Floating rate Term Loan Facility due January 2, 2026 | Line of credit
Debt Instrument [Line Items]
Principal debt issued		$ 1,000,000,000	$ 1,150,000,000
Debt repayments	$ 150,000,000
Floating rate Term Loan Facility due January 2, 2026 | Line of credit | Unsecured debt
Debt Instrument [Line Items]
Debt, term		3 years
Maximum borrowing capacity		$ 2,000,000,000