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AOCI - Schedule of AOCI Components (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019
Fuel derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | $ 42 | $ (56)
Changes in fair value | (71) | 16
Ending Balance | (31) | (31)
Interest rate derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (14) | 0
Changes in fair value | (20) | (35)
Reclassification to earnings | (1) | (2)
Ending Balance | (33) | (33)
Defined Benefit Plan Items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 58 | 58
Changes in fair value | 0 | 0
Reclassification to earnings | 0 | 0
Ending Balance | 58 | 58
Other comprehensive income other changes net of tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 39 | 25
Changes in fair value | 6 | 20
Reclassification to earnings | 0 | 0
Ending Balance | 45 | 45
Deferred Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (29) | (7)
Changes in fair value | 20 | 0
Reclassification to earnings | 0 | (2)
Ending Balance | (9) | (9)
AOCI Including Portion Attributable to Noncontrolling Interest |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 96 | 20
Changes in fair value | (65) | 1
Reclassification to earnings | (1) | 9
Ending Balance | 30 | 30
Reclassification out of Accumulated Other Comprehensive Income | Fuel derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification to earnings | $ (2) | $ 9

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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