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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value |  |
Gross amounts of recognized assets | $ 696 | $ 134
Gross amounts offset in the balance sheet | 4 | 6
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 409 | 13
Gross amounts of recognized liabilities | 80 | 3
Gross amounts offset in the balance sheet | 80 | 3
Gross amounts offset in the balance sheet | 80 | 3
Cash collateral deposits held from counterparties for fuel contracts - current | 80 | 3
Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 287 | 121
Gross amounts of recognized liabilities | 95 | 31
Gross amounts offset in the balance sheet | 95 | 31
Gross amounts offset in the balance sheet | 95 | 31
Cash collateral deposits held from counterparties for fuel contracts - current | 95 | 31
Fuel derivative contracts | Accounts and other receivables |  |
Derivatives, Fair Value |  |
Receivable from third parties for fuel contracts | 8 | 0
Interest rate derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value |  |
Gross amounts offset in the balance sheet | 0 | 0
Gross amounts offset in the balance sheet | 4 | 6
Designated as Hedging Instrument |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 696 | 130
Gross amounts offset in the balance sheet | 4 | 6
Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 409 | 9
Designated as Hedging Instrument | Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | 287 | 121
Designated as Hedging Instrument | Interest rate derivatives | Other noncurrent liabilities |  |
Derivatives, Fair Value |  |
Gross amounts offset in the balance sheet | 4 | 6
Not Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value |  |
Gross amounts of recognized assets | $ 0 | $ 4

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