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Debt - Borrowings and Repayments and Letters of Credit (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Debt
Outstanding letters of credit	$ 161		$ 205
Credit Facilities and Commercial Paper Program
Debt
Total borrowings	9,100	$ 1,500
Total repayments	$ 9,000	$ 1,500

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of cash outflow for short-term and long-term debt. Excludes payment of lease obligation.

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