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Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Maximum sum of derivatives of counterparty to be included in other (less than $10 million) | $ 16 |
Letter of credit substitution percentage | 100.00% |
Cash collateral provided as a percentage of derivative contract value (in hundredths) | 100.00% |
Fuel derivative contracts |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | $ 512 |
Cash collateral held from CP | 106 | $ 175
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty A |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 139 |
Cash collateral held from CP | 106 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty A | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (100) |
Fair value of fuel derivative level at which cash is received from CP | 0 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty B |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 66 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty B | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (50) |
Fair value of fuel derivative level at which cash is received from CP | 150 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty C |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 107 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty C | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (75) |
Fair value of fuel derivative level at which cash is received from CP | 250 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty D |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 23 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty D | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (125) |
Fair value of fuel derivative level at which cash is received from CP | 125 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty E |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 68 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty E | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (40) |
Fair value of fuel derivative level at which cash is received from CP | 100 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty F |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 40 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | 0 |
Fuel derivative contracts | Counterparty F | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (65) |
Fair value of fuel derivative level at which cash is received from CP | 70 |
If credit rating is non-investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative level at which cash is received from CP |  |
Fuel derivative contracts | Counterparty G |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 53 |
Cash collateral held from CP | 0 |
Letters of credit (LC) |  |
Fuel derivative contracts | Counterparty G | Minimum |  |
If credit rating is investment grade, fair value of fuel derivative level at which: |  |
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1 | (100) |
Fair value of fuel derivative level at which cash is received from CP | 100 |
Fuel derivative contracts | Counterparty Other |  |
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items] |  |
Fair value of fuel derivatives | 16 |
Cash collateral held from CP | 0 |
Letters of credit (LC) | $ 0 |

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