Debt - Schedule of Debt (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Feb. 28, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Debt issuance costs and discounts	$ (429)		$ (369)
Total long-term debt (average life of 11.9 years, rates averaging 5.1%)	42,705		43,031
Total debt	44,483		43,031
Less amounts due within one year	5,104		4,698
Long-term debt	39,379		38,333
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,778		0
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Senior secured debt	0	$ 1,238	1,238
Other Senior Secured Debt [Member]
Debt Instrument [Line Items]
Other senior secured debt	1,059		1,046
Senior Unsecured Credit Facilities [Member]
Debt Instrument [Line Items]
Senior unsecured debt	0		0
Senior Unsecured Notes Payable Through 2095 [Member]
Debt Instrument [Line Items]
Senior unsecured debt	$ 42,075		$ 41,116