Debt (Outstanding Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Nov. 30, 2024	Feb. 29, 2024
Debt Instrument [Line Items]
Current portion of long-term debt	$ 1,263	$ 519
Short-term debt	1,263	519
Long-term debt	19,580	19,947
Long-term debt, net	18,317	19,428
Senior notes – 3.50% due 2025
Debt Instrument [Line Items]
Long-term debt	$ 0	500
Interest rate (as a percent)	3.50%
Senior notes – 1.349% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 643	579
Interest rate (as a percent)	1.349%
Senior notes – 3.75% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 600	599
Interest rate (as a percent)	3.75%
Senior notes – 4.550% due 2027
Debt Instrument [Line Items]
Long-term debt	$ 945	945
Interest rate (as a percent)	4.55%		4.55%
Senior notes – Floating due 2027
Debt Instrument [Line Items]
Long-term debt	$ 298	299
Senior notes – 4.375% due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,500	1,499
Interest rate (as a percent)	4.375%
Senior notes – 1.979% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 642	566
Interest rate (as a percent)	1.979%
Senior notes – 2.25% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 743	742
Interest rate (as a percent)	2.25%
Senior notes – 4.65% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 992	991
Interest rate (as a percent)	4.65%
Senior notes – 2.375% due 2031
Debt Instrument [Line Items]
Long-term debt	$ 398	397
Interest rate (as a percent)	2.375%
Senior notes – 4.850% due 2031
Debt Instrument [Line Items]
Long-term debt	$ 992	992
Interest rate (as a percent)	4.85%		4.85%
Senior notes – 5.750% due 2032
Debt Instrument [Line Items]
Long-term debt	$ 494	494
Interest rate (as a percent)	5.75%
Senior notes – 5.875% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 299	299
Interest rate (as a percent)	5.875%
Senior notes – 5.400% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 593	593
Interest rate (as a percent)	5.40%
Senior notes – 5.150% due 2034
Debt Instrument [Line Items]
Long-term debt	$ 496	495
Interest rate (as a percent)	5.15%			5.15%
Senior notes – 5.00% due 2035
Debt Instrument [Line Items]
Long-term debt	$ 1,982	1,982
Interest rate (as a percent)	5.00%
Senior notes – 4.75% due 2039
Debt Instrument [Line Items]
Long-term debt	$ 496	496
Interest rate (as a percent)	4.75%
Senior notes – 5.35% due 2044
Debt Instrument [Line Items]
Long-term debt	$ 494	495
Interest rate (as a percent)	5.35%
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	$ 594	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	$ 492	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%
Senior notes – 5.700% due 2053
Debt Instrument [Line Items]
Long-term debt	$ 989	989
Interest rate (as a percent)	5.70%
Senior notes – 5.450% due 2054
Debt Instrument [Line Items]
Long-term debt	$ 493	493
Interest rate (as a percent)	5.45%			5.45%
Senior notes – 5.40% due 2055
Debt Instrument [Line Items]
Long-term debt	$ 1,479	1,479
Interest rate (as a percent)	5.40%
Mortgage – 5.70% due 2035
Debt Instrument [Line Items]
Long-term debt	$ 254	267
Interest rate (as a percent)	5.70%
Other
Debt Instrument [Line Items]
Long-term debt	$ 2	$ 2