Debt - Debt With Interest Rates And Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Finance lease, liability, statement of financial position [Extensible Enumeration]	Long-term debt	Long-term debt
Finance leases	$ 18	$ 13
Discounts, premiums, and debt issuance costs	(876)	(902)
Total debt	17,087	17,206
Less current maturities	(607)	(555)
Long-term debt	$ 16,480	16,651
4.19% maturing to 2030
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	4.19%
Notes and debentures	$ 3,030	3,580
4.28% maturing 2031 to 2035
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	4.28%
Notes and debentures	$ 2,684	2,284
4.28% maturing 2037 to 2064
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	4.28%
Notes and debentures	$ 10,847	10,847
5.22% maturing 2097 to 2121
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	5.22%
Notes and debentures	$ 1,384	$ 1,384