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Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, net of tax |  | $ (777) | $ 8,659 | $ (831)
Changes in value, net of tax |  | 17 |  | (20)
Amounts reclassified to earnings, net of tax |  | 26 |  | 117
Total other comprehensive income (loss), net | $ (8) | 43 | (15) | 97
Ending Balance, net of tax | 8,854 | (734) | 8,854 | (734)
Pension and Other Postretirement Liabilities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax | (867) | (401) | (854) | (363)
Changes in value, before tax | (7) | 10 | (33) | (33)
Amounts reclassified to earnings, before tax | 14 | 6 | 27 | 11
Net change, before tax | 7 | 16 | (6) | (22)
Ending Balance, before tax | (860) | (385) | (860) | (385)
Beginning Balance, deferred taxes | 29 | (140) | 24 | (154)
Changes in value, deferred taxes | 2 | (4) | 12 | 12
Amounts reclassified to earnings, deferred taxes | (5) | (2) | (10) | (4)
Net change, deferred taxes | (3) | (6) | 2 | 8
Ending Balance, deferred taxes | 26 | (146) | 26 | (146)
Derivative Contracts | Fuel |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax |  | (93) | (2) | (215)
Changes in value, before tax |  | 17 |  | 1
Amounts reclassified to earnings, before tax |  | 35 | 2 | 173
Net change, before tax |  | 52 | 2 | 174
Ending Balance, before tax |  | (41) |  | (41)
Beginning Balance, deferred taxes |  | (146) | 1 | (102)
Changes in value, deferred taxes |  | (6) |  |
Amounts reclassified to earnings, deferred taxes |  | (13) | (1) | (63)
Net change, deferred taxes |  | (19) | (1) | (63)
Ending Balance, deferred taxes |  | (165) |  | (165)
Investments and Other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax | 1 | 3 | 1 | 3
Changes in value, before tax | (17) |  | (17) |
Net change, before tax | (17) |  | (17) |
Ending Balance, before tax | (16) | $ 3 | (16) | $ 3
Beginning Balance, deferred taxes | 1 |  | 1 |
Changes in value, deferred taxes | 6 |  | 6 |
Amounts reclassified to earnings, deferred taxes | (1) |  | (1) |
Net change, deferred taxes | 5 |  | 5 |
Ending Balance, deferred taxes | 6 |  | 6 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, net of tax | (836) |  | (829) |
Changes in value, net of tax | (16) |  | (32) |
Amounts reclassified to earnings, net of tax | 8 |  | 17 |
Total other comprehensive income (loss), net | (8) |  | (15) |
Ending Balance, net of tax | $ (844) |  | $ (844) |

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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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=84158357&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=84228862&loc=SL7669686-108580 + Details
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