Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets:
U.S. government securities	$ 171	$ 256
U.S. government securities - available for sale	10	0
Loan receivable	347	351
Derivative instruments	281	255
Total	3,288	3,466
Liabilities:
Derivative instruments	139	229
Mortgage and loans payable	29	706
Senior notes	18,433	17,297
Total	18,601	18,232
Money market funds
Assets:
Cash and cash equivalents	769	1,333
Time deposits
Assets:
Cash and cash equivalents	1,710	1,271
Level 1
Assets:
U.S. government securities	50	0
U.S. government securities - available for sale	0	0
Loan receivable	0	0
Derivative instruments	0	0
Total	819	1,333
Liabilities:
Derivative instruments	0	0
Mortgage and loans payable	0	0
Senior notes	18,010	16,847
Total	18,010	16,847
Level 1 | Money market funds
Assets:
Cash and cash equivalents	769	1,333
Level 1 | Time deposits
Assets:
Cash and cash equivalents	0	0
Level 2
Assets:
U.S. government securities	121	256
U.S. government securities - available for sale	10	0
Loan receivable	0	0
Derivative instruments	281	255
Total	2,122	1,782
Liabilities:
Derivative instruments	139	229
Mortgage and loans payable	29	706
Senior notes	423	450
Total	591	1,385
Level 2 | Money market funds
Assets:
Cash and cash equivalents	0	0
Level 2 | Time deposits
Assets:
Cash and cash equivalents	1,710	1,271
Level 3
Assets:
U.S. government securities	0	0
U.S. government securities - available for sale	0	0
Loan receivable	347	351
Derivative instruments	0	0
Total	347	351
Liabilities:
Derivative instruments	0	0
Mortgage and loans payable	0	0
Senior notes	0	0
Total	0	0
Level 3 | Money market funds
Assets:
Cash and cash equivalents	0	0
Level 3 | Time deposits
Assets:
Cash and cash equivalents	$ 0	$ 0