Debt - Long-Term Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total debt	$ 5,416	$ 5,413
Less: current maturities	(125)	(125)
Long-term debt	5,291	5,288
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	125	125
3.450% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	299	299
3.500% Senior Notes, Due 2027
Debt Instrument [Line Items]
Total debt	493	493
2.500% Senior Notes, Due 2030
Debt Instrument [Line Items]
Total debt	473	472
2.400% Senior Notes, Due 2031
Debt Instrument [Line Items]
Total debt	891	890
5.150% Senior Notes, Due 2034
Debt Instrument [Line Items]
Total debt	738	738
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228	228
4.250% Senior Notes, Due 2047
Debt Instrument [Line Items]
Total debt	591	591
3.200% Senior Notes, Due 2051
Debt Instrument [Line Items]
Total debt	851	851
5.500% Senior Notes, Due 2054
Debt Instrument [Line Items]
Total debt	$ 727	$ 726