Fair Value Measurements (Details) - Financial Instruments - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Financial Instruments
Short-term securities	$ 4,353	$ 5,137
Carrying Value [Member]
Financial Instruments
Short-term securities	4,353	5,137
Debt	7,932	7,931
Commercial paper	100	100
Fair Value [Member]
Financial Instruments
Short-term securities	4,353	5,137
Debt	7,205	7,645
Commercial paper	100	100
Fair Value [Member] | Level 1 [Member]
Financial Instruments
Short-term securities	619	1,171
Debt	0	0
Commercial paper	0	0
Fair Value [Member] | Level 2 [Member]
Financial Instruments
Short-term securities	3,687	3,912
Debt	7,205	7,645
Commercial paper	100	100
Fair Value [Member] | Level 3 [Member]
Financial Instruments
Short-term securities	47	54
Debt	0	0
Commercial paper	$ 0	$ 0