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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 444,000,000	$ 1,937,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	805,000,000	3,465,000,000
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	137,000,000	168,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	491,000,000	1,233,000,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	307,000,000	1,769,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	314,000,000	2,232,000,000
Fuel derivatives | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total Collateral Already Received Aggregate Fair Value		4,000,000	0
Fuel derivatives | Other Assets
Derivatives, Fair Value [Line Items]
Total Collateral Already Received Aggregate Fair Value		6,000,000	0
Fuel derivatives | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		311,000,000	235,000,000
Due To Third Parties For Settled Fuel Contracts		75,000,000	46,000,000
Fuel derivatives | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		0	600,000,000
Fuel derivatives | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	7,000,000	2,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	44,000,000	0
Fuel derivatives | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	126,000,000	2,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Fuel derivatives | Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	412,000,000	526,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	4,000,000	107,000,000
Fuel derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	0	658,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	0	55,000,000
Fuel derivatives | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	54,000,000	39,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	0	26,000,000
Fuel derivatives | Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	52,000,000	5,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	52,000,000	0
Fuel derivatives | Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	262,000,000	1,854,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	201,000,000	1,395,000,000
Fuel derivatives | Not Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	0	352,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	0	330,000,000
Interest rate derivatives | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		0	0
Interest rate derivatives | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	2,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Interest rate derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	35,000,000	49,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	$ 0	$ 0
[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

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Amount due to third parties for settled fuel contracts as of the end of the period reported, recorded in Accrued liabilities on the balance sheet.

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