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Leases (Tables)
 9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Components of lease expense
The components of our lease expense were as follows (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2020202120202021
Lease cost
Finance lease cost:
      Amortization of assets$53 $53 $146 $166 
      Interest on lease liabilities4 2 12 9 
Operating lease cost170 70 381 220 
Short-term lease cost4 2 14 6 
Variable lease cost21 24 83 66 
Sublease income(1)(3)(2)(4)
Total lease cost$251 $148 $634 $463 
Schedule of Lease Term and Discount Rate The assumptions used to value leases for the periods presented were as follows:
As of
December 31, 2020September 30, 2021
Weighted-average remaining lease term
     Operating leases16 years16 years
     Finance leases2 years2 years
Weighted-average discount rate
     Operating leases7.0 %7.1 %
     Finance leases5.4 %4.5 %
Maturity of Lease Liabilities, Operating
Maturities of lease liabilities were as follows (in millions):
As of September 30, 2021
Operating LeasesFinance Leases
Remainder of 2021$29 $47 
2022310 145 
2023284 44 
2024238 17 
2025189 1 
Thereafter2,109 — 
Total undiscounted lease payments3,159 254 
Less: imputed interest(1,503)(11)
Total lease liabilities$1,656 $243 
Maturity of Lease Liabilities, Finance
Maturities of lease liabilities were as follows (in millions):
As of September 30, 2021
Operating LeasesFinance Leases
Remainder of 2021$29 $47 
2022310 145 
2023284 44 
2024238 17 
2025189 1 
Thereafter2,109 — 
Total undiscounted lease payments3,159 254 
Less: imputed interest(1,503)(11)
Total lease liabilities$1,656 $243