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AOCI - Schedule of AOCI Components (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Fuel derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | $ (209) | $ (125)
Changes in fair value | 11 | (97)
Ending Balance | (170) | (170)
Interest rate derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (75) | (33)
Changes in fair value | 0 | (42)
Reclassification to earnings | 1 | 1
Ending Balance | (74) | (74)
Defined Benefit Plan Items |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 20 | 20
Changes in fair value | 0 | 0
Reclassification to earnings | 0 | 0
Ending Balance | 20 | 20
Other comprehensive income (loss) other changes net of tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 22 | 59
Changes in fair value | 33 | (4)
Reclassification to earnings | 0 | 0
Ending Balance | 55 | 55
Deferred Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | 56 | 18
Changes in fair value | (10) | 33
Reclassification to earnings | (7) | (12)
Ending Balance | 39 | 39
AOCI Including Portion Attributable to Noncontrolling Interest |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning Balance | (186) | (61)
Changes in fair value | 34 | (110)
Reclassification to earnings | 22 | 41
Ending Balance | (130) | (130)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Fuel derivatives |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Reclassification to earnings | $ 28 | $ 52

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