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Investments and Fair Value Measurements - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Fair Value [Line Items] |
Investments in securities accounted for under the equity method | $ 126
Asset-backed Securities | Minimum |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 1 year
Asset-backed Securities | Maximum |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 15 years
Corporate Debt |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 3 years
CDARS |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 1 year
U.S. Government and Other Securities |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 3 years
Fixed Income Securities |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 2 years
Azul |
Fair Value [Line Items] |
Equity stake | 2.00%
Carrying value of investment | $ 385
Azul | Preferred Stock |
Fair Value [Line Items] |
Equity stake | 8.00%
Republic |
Fair Value [Line Items] |
Ownership stake | 19.00%
ManaAir |
Fair Value [Line Items] |
Ownership stake | 49.90%
Champlain |
Fair Value [Line Items] |
Ownership stake | 40.00%
Fulcrum |
Fair Value [Line Items] |
Ownership interest | 0.07
Carrying value of other investment | $ 51
Fulcrum | Preferred Stock |
Fair Value [Line Items] |
Ownership interest | 0.08

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