Fair Value Measurements - Fair Values and Related Carrying Values of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, net, carrying amount	$ 940	$ 257
Notes receivable, net, fair value	953	270
Debt, excluding capital lease obligations, carrying amount	(53,625)	(52,055)
Debt, excluding capital lease obligations, fair value	(51,089)	(51,039)
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, net, fair value	941	270
Debt, excluding capital lease obligations, fair value	(51,089)	$ (51,039)
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, net, fair value	$ 12