Fair Value Measurements - Schedule of Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Assets:
Derivative instruments	$ 231	$ 591
Liabilities:
Derivative instruments	203	72
Allowance for credit losses	0
Fair Value, Recurring
Assets:
Loan receivable	345	280
Derivative instruments	231	591
Total	2,844	3,914
Liabilities:
Derivative instruments	203	72
Mortgage and loans payable	706	654
Senior notes	15,605	13,342
Total	16,514	14,068
Fair Value, Recurring | U.S. government securities
Assets:
Held-to-maturity, fair value	299	0
Fair Value, Recurring | Money market funds
Assets:
Cash and cash equivalents	1,369	2,401
Fair Value, Recurring | Time deposits
Assets:
Cash and cash equivalents	600	642
Fair Value, Recurring | Level 1
Assets:
Loan receivable	0	0
Derivative instruments	0	0
Total	1,413	2,516
Liabilities:
Derivative instruments	0	0
Mortgage and loans payable	0	0
Senior notes	15,124	12,851
Total	15,124	12,851
Fair Value, Recurring | Level 1 | U.S. government securities
Assets:
Held-to-maturity, fair value	0	0
Fair Value, Recurring | Level 1 | Money market funds
Assets:
Cash and cash equivalents	1,369	2,401
Fair Value, Recurring | Level 1 | Time deposits
Assets:
Cash and cash equivalents	44	115
Fair Value, Recurring | Level 2
Assets:
Loan receivable	0	0
Derivative instruments	231	591
Total	1,086	1,118
Liabilities:
Derivative instruments	203	72
Mortgage and loans payable	706	654
Senior notes	481	491
Total	1,390	1,217
Fair Value, Recurring | Level 2 | U.S. government securities
Assets:
Held-to-maturity, fair value	299	0
Fair Value, Recurring | Level 2 | Money market funds
Assets:
Cash and cash equivalents	0	0
Fair Value, Recurring | Level 2 | Time deposits
Assets:
Cash and cash equivalents	556	527
Fair Value, Recurring | Level 3
Assets:
Loan receivable	345	280
Derivative instruments	0	0
Total	345	280
Liabilities:
Derivative instruments	0	0
Mortgage and loans payable	0	0
Senior notes	0	0
Total	0	0
Fair Value, Recurring | Level 3 | U.S. government securities
Assets:
Held-to-maturity, fair value	0	0
Fair Value, Recurring | Level 3 | Money market funds
Assets:
Cash and cash equivalents	0	0
Fair Value, Recurring | Level 3 | Time deposits
Assets:
Cash and cash equivalents	$ 0	$ 0