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Debt - Senior Notes, Credit Facilities, Borrowings and Repayments and Letters of Credit (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jan. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Outstanding letters of credit	$ 81			$ 90
Senior Notes
Debt Instrument [Line Items]
Debt instrument face value	8,200			$ 7,200
5.95 % senior notes due June 2035 | Senior Notes
Debt Instrument [Line Items]
Debt instrument face value			$ 1,000
Debt instrument, interest rate (as a percent)			5.95%
Public offering price (as a percent)			99.761%
Commercial Paper Program
Debt Instrument [Line Items]
Total borrowings	27,600	$ 20,600
Total repayments	$ 27,500	$ 21,000

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