Debt (Schedule Of Outstanding Debt) (Details) - USD ($)	Mar. 31, 2024	Feb. 29, 2024	Dec. 31, 2023	Sep. 30, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Commercial paper outstanding	$ 50,000,000		$ 0
Current portion of long-term debt	1,119,000,000		1,619,000,000
Short-term debt	1,169,000,000		1,619,000,000
Long-term debt	13,419,000,000		13,463,000,000
Long-term debt, net	12,300,000,000		11,844,000,000
Senior notes – 3.50% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 600,000,000		600,000,000
Interest rate	3.50%
Senior notes – 3.875% due 2024
Debt Instrument [Line Items]
Long-term debt	$ 0		1,000,000,000
Interest rate	3.875%
Senior notes – 3.50% due 2025
Debt Instrument [Line Items]
Long-term debt	$ 499,000,000		499,000,000
Interest rate	3.50%
Senior notes – 1.349% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 601,000,000		617,000,000
Interest rate	1.349%
Senior notes – 3.75% due 2026
Debt Instrument [Line Items]
Long-term debt	$ 599,000,000		599,000,000
Interest rate	3.75%
Senior notes – 4.375% due 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,499,000,000		1,499,000,000
Interest rate	4.375%
Senior notes – 1.979% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 587,000,000		601,000,000
Interest rate	1.979%
Senior notes – 2.25% due 2030
Debt Instrument [Line Items]
Long-term debt	$ 742,000,000		741,000,000
Interest rate	2.25%
Senior notes – 2.375% due 2031
Debt Instrument [Line Items]
Long-term debt	$ 397,000,000		397,000,000
Interest rate	2.375%
Senior notes – 5.750% due 2032
Debt Instrument [Line Items]
Long-term debt	$ 493,000,000		493,000,000
Interest rate	5.75%
Senior notes – 5.875% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 298,000,000		298,000,000
Interest rate	5.875%
Senior notes – 5.400% due 2033
Debt Instrument [Line Items]
Long-term debt	$ 592,000,000		592,000,000
Interest rate	5.40%			5.40%
Senior notes – 5.150% due 2034
Debt Instrument [Line Items]
Long-term debt	$ 496,000,000		0
Interest rate	5.15%	5.15%
Senior notes – 4.75% due 2039
Debt Instrument [Line Items]
Long-term debt	$ 496,000,000		496,000,000
Interest rate	4.75%
Senior notes – 4.35% due 2047
Debt Instrument [Line Items]
Long-term debt	$ 494,000,000		494,000,000
Interest rate	4.35%
Senior notes – 4.20% due 2048
Debt Instrument [Line Items]
Long-term debt	$ 593,000,000		593,000,000
Interest rate	4.20%
Senior notes – 4.90% due 2049
Debt Instrument [Line Items]
Long-term debt	$ 1,239,000,000		1,239,000,000
Interest rate	4.90%
Senior notes – 2.90% due 2051
Debt Instrument [Line Items]
Long-term debt	$ 346,000,000		346,000,000
Interest rate	2.90%
Senior notes – 6.25% due 2052
Debt Instrument [Line Items]
Long-term debt	$ 491,000,000		491,000,000
Interest rate	6.25%
Senior notes – 5.450% due 2053
Debt Instrument [Line Items]
Long-term debt	$ 591,000,000		591,000,000
Interest rate	5.45%				5.45%
Senior notes – 5.700% due 2053
Debt Instrument [Line Items]
Long-term debt	$ 988,000,000		988,000,000
Interest rate	5.70%
Senior notes – 5.450% due 2054
Debt Instrument [Line Items]
Long-term debt	$ 494,000,000		0
Interest rate	5.45%	5.45%
Mortgage – 5.70% due 2035
Debt Instrument [Line Items]
Long-term debt	$ 280,000,000		284,000,000
Interest rate	5.70%
Other
Debt Instrument [Line Items]
Long-term debt	$ 4,000,000		$ 5,000,000