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Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of debt instruments The total outstanding debt is summarized below (in millions, except percentages):
MaturityCoupon RateEffective Interest RateAs of December 31, 2019As of
December 31, 2020
Debt
2011-2016 Notes Issuances2021 - 2026
2.00% - 3.63%
2.23% - 3.73%
$4,000 $4,000 
2020 Notes Issuance2025 - 2060
0.45% - 2.25%
0.57% - 2.33%
10,000 
Future finance lease payments, net(1)
711 1,201 
      Total debt4,711 15,201 
Unamortized discount and debt issuance costs(42)(169)
Less: Current portion of Notes(2)
(999)
Less: Current portion future finance lease payments, net(1)(2)
(115)(101)
       Total long-term debt$4,554 $13,932 
(1)Net of imputed interest.
(2)Total current portion of long-term debt is included within other accrued expenses and current liabilities. See Note 7.
Schedule of debt maturities
As of December 31, 2020, the aggregate future principal payments for long-term debt, including finance lease liabilities, for each of the next five years and thereafter are as follows (in millions):
2021$1,104 
202286
202386
20241,087
20251,088
Thereafter11,868
Total$15,319