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Long-Term Debt and Credit Facilities (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt consisted of the following at December 31:
  Weighted Average Interest RateMaturities20202019
Notes1.9%2021-2078$6,170 $6,988 
Commercial paper(0.3)%20211,139 579 
Finance Lease ObligationsVariousVarious34 20 
7,343 7,587 
Less: Current portion of long-term debt(9)(254)
Total $7,334 $7,333 
Schedule of Maturities of Long-term Debt Excluding such obligations, scheduled maturities of long-term debt and finance leases outstanding as of December 31, 2020, were as follows:  
Years Ended December 31,
2021
$631 
2022413 
2023896 
2024498 
2025130 
Thereafter3,636