BORROWINGS - Narrative (Details)	6 Months Ended
Jun. 30, 2024 USD ($) series	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure		$ 114,000,000
Guarantee obligation, carrying value	$ 4,000,000	4,000,000
Commercial contracts
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure	812,000,000	751,000,000
Equipment residual value obligation
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure	28,000,000	39,000,000
Senior notes \| Senior unsecured notes
Debt Instrument [Line Items]
Debt, principal amount	$ 8,250,000,000
Number of debt series \| series	6
Debt repayments	$ 0
Line of credit \| Floating rate Term Loan Facility due January 2, 2026
Debt Instrument [Line Items]
Total amount of debt repaid	1,000,000,000
Debt repayments	150,000,000
Line of credit \| Revolving credit facility
Debt Instrument [Line Items]
Line of credit outstanding	$ 0	$ 0
Line of credit \| Revolving credit facility \| 5-Year Revolving Credit Facility
Debt Instrument [Line Items]
Debt, term	5 years
Maximum borrowing capacity	$ 2,500,000,000
Line of credit \| Revolving credit facility \| 364-Day Revolving Credit Facility
Debt Instrument [Line Items]
Debt, term	364 days
Maximum borrowing capacity	$ 1,000,000,000
Line of credit \| Unsecured debt \| Floating rate Term Loan Facility due January 2, 2026
Debt Instrument [Line Items]
Debt, term	3 years
Maximum borrowing capacity	$ 2,000,000,000

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Face (par) amount of the original debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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