Leases - Operating and Finance Lease Reconciliation (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Total	$ 46,164	$ 31,963
Total	30,437	28,875
Gross lease liabilities	76,601	60,838
Imputed interest - operating leases	(7,065)	(6,128)
Imputed interest - finance leases	(2,003)	(1,896)
Imputed interest	(9,068)	(8,024)
Present value of operating leases	39,099	25,835
Present value of finance leases	28,434	26,979
Present value of lease liabilities	67,533	52,814
Current portion of operating leases	(4,586)	(3,139)
Current portion of finance leases	(10,374)	(9,884)
Current portion of lease liabilities	(14,960)	(13,023)
Total long-term operating lease liabilities	34,513	22,696
Total long-term finance lease liabilities	18,060	17,095
Long-term lease liabilities	$ 52,573	$ 39,791
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	amzn:LeaseLiabilityNoncurrent	amzn:LeaseLiabilityNoncurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	amzn:LeaseLiabilityNoncurrent	amzn:LeaseLiabilityNoncurrent