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Financial Derivative Instruments Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 08, 2020 USD ($) | May 04, 2020 USD ($) | Mar. 31, 2020 Agreements
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Percentage of actual consumption hedged |  | 42.00% |  |  | 67.00% |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 1,800 | $ 2,000 |
Current Unrealized Net Losses in OCI |  | $ 53 |  |  | $ 53 |  |  |  |
Maximum sum of derivatives of counterparty to be included in other (less than $8 million) |  | $ 9 |  |  | $ 9 |  |  |  |
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 |  | $ 28 |  |  | $ 28 |  |  |  |
Payments of terminated interest rate derivative instruments |  | 31 |  | $ 0 | 31 | $ 0 |  |  |
Fuel derivatives |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Cash collateral held (from) by CP |  | 27 |  |  | 27 |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate Derivative |  |  |  | 12 |  | 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 |  | 22 |  |  | 38 |  |  |  |
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 |  | (1) |  |  | 28 |  |  |  |
Other Noncurrent Liabilities | Interest rate derivatives |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative contracts |  | 11 | 1 |  | 11 |  |  |  |
Accrued Liabilities [Member] | Interest rate derivatives |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Derivative contracts | [1] | $ 28 | $ 5 |  | $ 28 |  |  |  |
[1] | The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the unaudited Condensed Consolidated Balance Sheet in Note 10.

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