Debt Instrument, Guarantee Borrowings On Third Party Debt

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Debt Instrument, Guarantee Borrowings on Third Party Debt, Term

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Equity Method Investment, Voting Interest Percentage, Maximum Per Bylaws

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized and unrealized gain (loss) on investment.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Narrative (Details) - USD ($)	3 Months Ended
Investments - Narrative (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Unrealized gain on investments, net	$ 100,000,000	$ 18,000,000
Grupo Aeromexico
Schedule of Equity Method Investments [Line Items]
Voting interest limit per bylaws (percent)	49.00%
Equity method investment, ownership percentage	51.00%
Equity method investment	$ 864,000,000
Virgin Atlantic
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Equity method investment	$ 356,000,000
New DGS
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%
Equity method investment	$ 111,000,000
Air France-KLM \| Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity interests, ownership percentage	9.00%
Air France-KLM \| Common stock
Schedule of Equity Method Investments [Line Items]
Equity interests	$ 422,000,000
GOL
Schedule of Equity Method Investments [Line Items]
Equity interests, ownership percentage	9.00%
GOL \| Preferred stock
Schedule of Equity Method Investments [Line Items]
Equity interests	$ 217,000,000
China Eastern
Schedule of Equity Method Investments [Line Items]
Equity interests, ownership percentage	3.00%
Equity interests	$ 331,000,000
CLEAR
Schedule of Equity Method Investments [Line Items]
Equity interests, ownership percentage	7.00%
Republic Airways
Schedule of Equity Method Investments [Line Items]
Equity interests, ownership percentage	17.00%
Financial Guarantee \| Term loan facility
Schedule of Equity Method Investments [Line Items]
Guarantee borrowings on third party debt	$ 300,000,000
Guarantee borrowings on third party debt, term (in years)	5 years