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Commitments and Contingencies - Principal Contractual Commitments Excluding Open Orders (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Long-term debt principal and interest        
2021 $ 2,187      
2022 2,622      
2023 3,219      
2024 4,272      
2025 3,058      
Thereafter 35,680      
Total 51,038      
Operating lease liabilities        
2021 5,600      
2022 5,184      
2023 4,743      
2024 4,356      
2025 3,951      
Thereafter 22,330      
Total 46,164 $ 31,963    
Finance lease liabilities, including interest        
2021 10,778      
2022 7,246      
2023 3,456      
2024 1,389      
2025 1,035      
Thereafter 6,533      
Total 30,437 28,875    
Financing obligations, including interest        
2021 227      
2022 230      
2023 233      
2024 237      
2025 240      
Thereafter 3,751      
Total 4,918      
Leases not yet commenced        
2021 1,010      
2022 1,738      
2023 1,876      
2024 1,973      
2025 1,951      
Thereafter 20,321      
Total 28,869      
Unconditional purchase obligations        
2021 3,869      
2022 3,760      
2023 3,367      
2024 3,141      
2025 2,213      
Thereafter 136      
Total 16,486      
Other commitments        
2021 3,671      
2022 2,386      
2023 945      
2024 783      
2025 661      
Thereafter 8,351      
Total 16,797      
Total commitments        
2021 27,342      
2022 23,166      
2023 17,839      
2024 16,151      
2025 13,109      
Thereafter 97,102      
Total 194,709      
Accrued tax contingencies $ 2,820 $ 3,923 $ 3,414 $ 2,309