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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Components of Operating Lease Expense
Components of operating lease expense were as follows (in millions):
Year Ended December 31,
20192020
Operating lease cost$1,820 $2,267 
Variable lease cost541 619 
Total operating lease cost$2,361 $2,886 
Supplemental Information Related to Operating Leases
Supplemental information related to operating leases is as follows (in millions):
Year Ended December 31,
20192020
Cash payments for operating leases$1,661 $2,004 
New operating lease assets obtained in exchange for operating lease liabilities$4,391 $2,765 
Future Minimum Operating Lease Payments Future lease payments under operating leases as of December 31, 2020 were as follows (in millions):
2021$2,198 
20222,170 
20231,995 
20241,738 
20251,389 
Thereafter5,601 
Total future lease payments15,091 
Less imputed interest(2,251)
Total lease liability balance$12,840