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Debt - Senior Notes, Borrowings and Repayments and Letters of Credit (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jan. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Outstanding letters of credit	$ 70			$ 90
Senior Notes
Debt Instrument [Line Items]
Debt instrument face value	9,400			$ 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%
4.70% senior notes due January 2031 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument face value	$ 700
Debt instrument, interest rate (as a percent)	4.70%
Public offering price (as a percent)	99.865%
5.60% senior notes due January 2036 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument face value	$ 550
Debt instrument, interest rate (as a percent)	5.60%
Public offering price (as a percent)	99.798%
Commercial Paper Program
Debt Instrument [Line Items]
Total borrowings	$ 38,700	$ 20,700
Total repayments	$ 39,100	$ 21,100