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Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | $ 8,966 | $ 2,396 | $ 2,984 |
Comprehensive income (loss) adjustments |  | 2 | 248 | (1,687) |
Ending Balance |  | 8,659 | 8,966 | 2,396 |
Pension and Other Postretirement Liabilities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | (363) | (472) | 699 |
Other comprehensive income (loss) before reclassifications | [1] | (517) | 78 | (1,106) | [2]
Amounts reclassified from accumulated other comprehensive income |  | 26 | 31 | (65) | [2]
Comprehensive income (loss) adjustments |  | (491) | 109 | (1,171) |
Ending Balance |  | (854) | (363) | (472) |
Derivative Contracts | Fuel |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | (215) | (499) | 11 |
Other comprehensive income (loss) before reclassifications |  | (4) | (320) | (599) | [2]
Amounts reclassified from accumulated other comprehensive income |  | 217 | 604 | 89 | [2]
Comprehensive income (loss) adjustments |  | 213 | 284 | (510) |
Ending Balance |  | (2) | (215) | (499) |
Investments and Other |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | 3 | 7 | 13 |
Other comprehensive income (loss) before reclassifications |  |  | (4) |  |
Amounts reclassified from accumulated other comprehensive income |  | (1) |  | (6) | [2]
Comprehensive income (loss) adjustments |  | (1) | (4) | (6) |
Ending Balance |  | 2 | 3 | 7 |
Pension and Other Postretirement Deferred Taxes |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | (154) | (115) | (115) |
Other comprehensive income (loss) before reclassifications |  | 186 | (28) |  |
Amounts reclassified from accumulated other comprehensive income |  | (8) | (11) |  |
Comprehensive income (loss) adjustments |  | 178 | (39) |  |
Ending Balance |  | 24 | (154) | (115) |
Derivative Contracts Deferred Taxes | Fuel |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | (102) |  |  |
Other comprehensive income (loss) before reclassifications |  | 1 | 115 |  |
Amounts reclassified from accumulated other comprehensive income |  | 102 | (217) |  |
Comprehensive income (loss) adjustments |  | 103 | (102) |  |
Ending Balance |  | 1 | (102) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning Balance |  | (831) | (1,079) | 608 |
Other comprehensive income (loss) before reclassifications |  | (334) | (159) | (1,705) | [2]
Amounts reclassified from accumulated other comprehensive income |  | 336 | 407 | 18 | [2]
Comprehensive income (loss) adjustments |  | 2 | 248 | (1,687) |
Ending Balance |  | $ (829) | $ (831) | $ (1,079) |
[1] | Prior service credits increased by $30 million, $0 million and $3 million and actuarial gains (losses) increased (decreased) by approximately $560 million, $78 million and $(1.1) billion for 2016, 2015 and 2014, respectively.
[2] | Income tax expense for these items was offset by the Company's valuation allowance.

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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