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Commitment and Contingencies - Long Term Purchase Commitments (Details) $ in Millions | 3 Months Ended
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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.

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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
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