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Debt and Credit Facilities (Details) - USD ($)		3 Months Ended
Debt and Credit Facilities (Details) - USD ($)	Apr. 30, 2020	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Amounts outstanding under commercial paper program		$ 0
Other Long-term Debt		21,000,000			$ 16,000,000
Total debt		13,074,000,000			13,991,000,000
Less current maturities of debt		15,000,000			761,000,000
Total long-term debt		13,059,000,000			13,230,000,000
Unamortized debt issuance costs		69,000,000			71,000,000
Borrowing capacity on existing facilities		2,908,000,000			2,903,000,000
Fair value of senior unsecured notes		$ 13,634,000,000			15,022,000,000
Commercial Paper
Debt instrument, maturity		397 days
Commercial Paper \| Maximum
Commercial paper		$ 1,500,000,000
Senior Unsecured Notes 2.625% due 2021
Stated interest rate			2.625%	2.625%
Maturity Date		Mar. 15, 2021
Unsecured Debt		$ 0			750,000,000
Debt instrument, repurchased face amount		$ 750,000,000
Senior Unsecured Notes 1.125% due 2021
Stated interest rate			1.125%
Maturity Date		Nov. 30, 2023
Unsecured Debt		$ 646,000,000			668,000,000
Senior Unsecured Notes, 0.600% Due 2023
Stated interest rate			0.60%
Maturity Date		Dec. 01, 2023
Unsecured Debt		$ 597,000,000			597,000,000
Senior Unsecured Notes 3.375% due 2024
Stated interest rate			3.375%
Maturity Date		May 15, 2024
Unsecured Debt		$ 591,000,000			590,000,000
Senior Unsecured Notes, 0.250% Due 2024
Stated interest rate				0.25%
Maturity Date		Dec. 03, 2024
Unsecured Debt		$ 995,000,000			1,030,000,000
Senior Unsecured Notes, 1.150% Due 2025
Stated interest rate				1.15%
Maturity Date		Jun. 15, 2025
Unsecured Debt		$ 645,000,000			644,000,000
Senior Unsecured Notes 3.375% due 2025
Stated interest rate			3.375%
Maturity Date		Nov. 01, 2025
Unsecured Debt		$ 747,000,000			747,000,000
Senior Unsecured Notes 3.50% due 2026
Stated interest rate			3.50%
Maturity Date		Mar. 15, 2026
Unsecured Debt		$ 993,000,000			992,000,000
Senior Unsecured Notes 2.125% due 2027
Stated interest rate			2.125%
Maturity Date		Nov. 30, 2027
Unsecured Debt		$ 878,000,000			909,000,000
Senior Unsecured Notes 3.650% due 2028
Stated interest rate			3.65%
Maturity Date		Mar. 07, 2028
Unsecured Debt		$ 596,000,000			596,000,000
Senior Unsecured Notes, 0.750% Due 2029
Stated interest rate				0.75%
Maturity Date		Mar. 01, 2029
Unsecured Debt		$ 937,000,000			969,000,000
Senior Unsecured Notes, 1.950% Due 2030
Stated interest rate				1.95%
Maturity Date		Jun. 15, 2030
Unsecured Debt		$ 989,000,000			989,000,000
Senior Unsecured Notes 2.625% due 2030
Stated interest rate			2.625%
Maturity Date		Nov. 30, 2030
Unsecured Debt		$ 756,000,000			782,000,000
Senior Unsecured Notes, 1.000% Due 2031
Stated interest rate				1.00%
Maturity Date		Dec. 03, 2031
Unsecured Debt		$ 873,000,000			903,000,000
Senior Unsecured Notes 4.100% due 2043
Stated interest rate			4.10%
Maturity Date		Apr. 01, 2043
Unsecured Debt		$ 392,000,000			392,000,000
Senior Unsecured Notes 4.375% due 2044
Stated interest rate			4.375%
Maturity Date		May 15, 2044
Unsecured Debt		$ 395,000,000			395,000,000
Senior Unsecured Notes 4.625% due 2046
Stated interest rate			4.625%
Maturity Date		Mar. 15, 2046
Unsecured Debt		$ 982,000,000			981,000,000
Senior Unsecured Notes, 2.900% due 2050
Stated interest rate			2.90%
Maturity Date		Jun. 15, 2050
Unsecured Debt		$ 641,000,000			641,000,000
Term Loan
Maturity Date		Nov. 10, 2023
Long-term Debt		$ 400,000,000			$ 400,000,000
Revolving Credit Facility \| Credit Agreement
Debt instrument, maturity	364 days
Line of credit facility, maximum borrowing capacity	$ 1,500,000,000