Debt and Credit Facilities (Details) - USD ($)	6 Months Ended
Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Amounts outstanding under commercial paper program	$ 0
Other Long-term Debt	12,000,000		$ 16,000,000
Total debt	12,740,000,000		13,991,000,000
Less current maturities of debt	6,000,000		761,000,000
Total long-term debt	12,734,000,000		13,230,000,000
Unamortized debt issuance costs	66,000,000		71,000,000
Borrowing capacity on existing facilities	1,408,000,000		2,903,000,000
Fair value of senior unsecured notes	$ 13,881,000,000		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	$ 655,000,000		668,000,000
Debt instrument, repurchased face amount	$ 400,000,000
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	$ 592,000,000		590,000,000
Senior Unsecured Notes, 0.250% Due 2024
Stated interest rate	0.25%
Maturity Date	Dec. 03, 2024
Unsecured Debt	$ 1,010,000,000		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	$ 891,000,000		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	$ 950,000,000		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	$ 767,000,000		782,000,000
Senior Unsecured Notes, 1.000% Due 2031
Stated interest rate	1.00%
Maturity Date	Dec. 03, 2031
Unsecured Debt	$ 885,000,000		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	$ 642,000,000		641,000,000
Term Loan
Maturity Date	Nov. 10, 2023
Long-term Debt	$ 0		$ 400,000,000

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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