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Commitment and Contingencies - Long Term Purchase Commitments (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
aircraft
Dec. 31, 2020
aircraft
Long-term Purchase Commitment [Line Items]    
2021 | $ $ 0  
2022 | $ 700  
2023 | $ 1,100  
2024 | $ 1,000  
2025 | $ 1,100  
2026 | $ 1,200  
Thereafter | $ $ 7,200  
Total Number of Boeing 737 MAX 7 Firm Orders Added to Purchase Agreement per Supplemental Agreement No. 12 100  
Number of Boeing 737 MAX 7 Firm Orders Added to Purchase Agreement per Supplemental Agreement No. 12 to be Delivered in 2022 30  
Total Number of Boeing 737 MAX Options Added to Purchase Agreement per Supplemental Agreement No. 12 155  
Total Number of Boeing 737 MAX 8 Firm Orders Converted to 737 MAX 7 Firm Orders per Supplemental Agreement No. 12 70  
B-737-MAX 7    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 200  
B-737-MAX 7 | Current Year - 2021    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment [1] 0  
B-737-MAX 7 | Year Two - 2022    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 30  
B-737-MAX 7 | Year Two - 2023    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 30  
B-737-MAX 7 | Year Four - 2024    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 30  
B-737-MAX 7 | Year Five - 2025    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 30  
B-737-MAX 7 | Year Six - 2026    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
B-737-MAX 7 | Year Seven - 2027    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
B-737-MAX 7 | Year Eight - 2028    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
B-737-MAX 7 | Year Nine - 2029    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 20  
B-737-MAX 7 | Year Ten - 2030    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
B-737-MAX 7 | Year Eleven - 2031    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 0  
B-737-MAX 8    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment [2] 149  
Long Term Purchase Commitments Additional MAX 8s [3] 9  
Total Aircraft Delivered During the Three Months Ended March 31, 2021 20  
Owned Aircraft Delivered During the Three Months Ended March 31, 2021 12  
Leased Aircraft Delivered During the Three Months Ended March 31, 2021 8  
Leased Aircraft Delivered During the Three Months Ended December 31, 2020   7
Total Operating Leased Aircraft to be Delivered in 2020 and 2021 from Third Parties 16  
B-737-MAX 8 | Current Year - 2021    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment [1] 19  
Long Term Purchase Commitments Additional MAX 8s 9  
B-737-MAX 8 | Year Two - 2022    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 0  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Two - 2023    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 0  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Four - 2024    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 0  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Five - 2025    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 0  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Six - 2026    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Seven - 2027    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Eight - 2028    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 15  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Nine - 2029    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 30  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Ten - 2030    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 45  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737-MAX 8 | Year Eleven - 2031    
Long-term Purchase Commitment [Line Items]    
Long-term Purchase Commitment 10  
Long Term Purchase Commitments Additional MAX 8s 0  
B-737 MAX    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 270  
Long Term Purchase Commitments and Options, Total 628  
B-737 MAX | Current Year - 2021    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options [1] 0  
Long Term Purchase Commitments and Options, Total [1] 28  
B-737 MAX | Year Two - 2022    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 42  
Long Term Purchase Commitments and Options, Total 72  
B-737 MAX | Year Two - 2023    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 38  
Long Term Purchase Commitments and Options, Total 68  
B-737 MAX | Year Four - 2024    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 40  
Long Term Purchase Commitments and Options, Total 70  
B-737 MAX | Year Five - 2025    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 40  
Long Term Purchase Commitments and Options, Total 70  
B-737 MAX | Year Six - 2026    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 40  
Long Term Purchase Commitments and Options, Total 70  
B-737 MAX | Year Seven - 2027    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 30  
Long Term Purchase Commitments and Options, Total 60  
B-737 MAX | Year Eight - 2028    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 30  
Long Term Purchase Commitments and Options, Total 60  
B-737 MAX | Year Nine - 2029    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 10  
Long Term Purchase Commitments and Options, Total 60  
B-737 MAX | Year Ten - 2030    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 0  
Long Term Purchase Commitments and Options, Total 60  
B-737 MAX | Year Eleven - 2031    
Long-term Purchase Commitment [Line Items]    
Long Term Purchase Options 0  
Long Term Purchase Commitments and Options, Total 10  
[1] Includes 20 737 MAX 8s delivered as of March 31, 2021, consisting of 12 owned and 8 leased aircraft.
[2] The Company has flexibility to designate firm orders or options as MAX 7 or MAX 8, upon written advance notification as stated in the contract.
[3] These 9 additional MAX 8 aircraft are leases to be acquired from various third parties, including 8 leased MAX 8 aircraft delivered in first quarter 2021. The Company also received 7 leased MAX 8 aircraft in fourth quarter 2020, for a total of 16 MAX 8 operating leased aircraft from third parties in 2020 and 2021, combined.