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Financial Derivative Instruments Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 08, 2020 USD ($) | May 04, 2020 USD ($) | Dec. 31, 2019 Agreements | Jun. 30, 2019
Derivative [Line Items] |  |  |  |  |  |  |
Percentage of actual consumption hedged | 95.00% |  | 79.00% |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 1,800 | $ 2,000 |  |
Current Unrealized Net Losses in OCI | $ 63 |  | $ 63 |  |  |  |
Maximum sum of derivatives of counterparty to be included in other (less than $8 million) | $ 8 |  | $ 8 |  |  |  |
Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts | 100.00% |  | 100.00% |  |  |  |
Letter of Credit Percent of Collateral | 100.00% |  | 100.00% |  |  |  |
Terminated Interest Rate Swap Liability | $ 31 |  | $ 31 |  |  |  |
Fuel derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash collateral held (from) by CP | 32 |  | 32 |  |  |  |
Interest rate swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Interest Rate Derivative |  |  |  |  |  | 12 | 12
Interest rate derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash collateral held (from) by CP | 0 |  | 0 |  |  |  |
Discontinuation of Interest Rate Cash Flow Hedge Balance in AOCI |  | $ 32 |  |  |  |  |
Not Designated as Hedging Instrument | Fuel derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring | 14 |  | 16 |  |  |  |
Not Designated as Hedging Instrument | Interest rate derivatives |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Discontinuation of Interest Rate Cash Flow Hedge Balance in AOCI | 14 |  | 31 |  |  |  |
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments | $ 5 |  | $ 29 |  |  |  |

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- Definition Interest Rate Swap Derivative, Aircraft Leases + References No definition available. + Details
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