Debt (Outstanding Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Feb. 29, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Current portion of long-term debt	$ 518			$ 1,619
Short-term debt	518			1,619
Long-term debt	12,848			13,463
Long-term debt, net	12,330			11,844
Senior notes – 3.50% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 0			600
Interest rate (as a percent)	3.50%	3.50%
Senior notes – 3.875% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 0			1,000
Interest rate (as a percent)	3.875%
Senior notes – 3.50% due 2025
Debt Instrument [Line Items]
Long-term debt	$ 500			499
Interest rate (as a percent)	3.50%
Senior notes – 1.349% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 623			617
Interest rate (as a percent)	1.349%
Senior notes – 3.75% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 599			599
Interest rate (as a percent)	3.75%
Senior notes – 4.375% due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,499			1,499
Interest rate (as a percent)	4.375%
Senior notes – 1.979% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 603			601
Interest rate (as a percent)	1.979%
Senior notes – 2.25% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 742			741
Interest rate (as a percent)	2.25%
Senior notes – 2.375% due 2031
Debt Instrument [Line Items]
Long-term debt	$ 397			397
Interest rate (as a percent)	2.375%
Senior notes – 5.750% due 2032
Debt Instrument [Line Items]
Long-term debt	$ 493			493
Interest rate (as a percent)	5.75%
Senior notes – 5.875% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 298			298
Interest rate (as a percent)	5.875%
Senior notes – 5.400% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 593			592
Interest rate (as a percent)	5.40%				5.40%
Senior notes – 5.150% due 2034
Debt Instrument [Line Items]
Long-term debt	$ 495			0
Interest rate (as a percent)	5.15%		5.15%
Senior notes – 4.75% due 2039
Debt Instrument [Line Items]
Long-term debt	$ 496			496
Interest rate (as a percent)	4.75%
Senior notes – 4.35% due 2047
Debt Instrument [Line Items]
Long-term debt	$ 494			494
Interest rate (as a percent)	4.35%
Senior notes – 4.20% due 2048
Debt Instrument [Line Items]
Long-term debt	$ 593			593
Interest rate (as a percent)	4.20%
Senior notes – 4.90% due 2049
Debt Instrument [Line Items]
Long-term debt	$ 1,239			1,239
Interest rate (as a percent)	4.90%
Senior notes – 2.90% due 2051
Debt Instrument [Line Items]
Long-term debt	$ 346			346
Interest rate (as a percent)	2.90%
Senior notes – 6.25% due 2052
Debt Instrument [Line Items]
Long-term debt	$ 491			491
Interest rate (as a percent)	6.25%
Senior notes – 5.450% due 2053
Debt Instrument [Line Items]
Long-term debt	$ 591			591
Interest rate (as a percent)	5.45%					5.45%
Senior notes – 5.700% due 2053
Debt Instrument [Line Items]
Long-term debt	$ 988			988
Interest rate (as a percent)	5.70%				5.70%
Senior notes – 5.450% due 2054
Debt Instrument [Line Items]
Long-term debt	$ 493			0
Interest rate (as a percent)	5.45%		5.45%
Mortgage – 5.70% due 2035
Debt Instrument [Line Items]
Long-term debt	$ 271			284
Interest rate (as a percent)	5.70%
Other
Debt Instrument [Line Items]
Long-term debt	$ 4			$ 5