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Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, net of tax |  | $ (734) | $ 8,659 | $ (831)
Changes in value, net of tax |  | (83) |  | (103)
Amounts reclassified to earnings, net of tax |  | 19 |  | 136
Total other comprehensive income (loss), net | $ 20 | (64) | 5 | 33
Ending Balance, net of tax | 8,970 | (798) | 8,970 | (798)
Pension and Other Postretirement Liabilities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax | (860) | (385) | (854) | (363)
Changes in value, before tax | (9) | (124) | (42) | (157)
Amounts reclassified to earnings, before tax | 14 | 6 | 41 | 17
Net change, before tax | 5 | (118) | (1) | (140)
Ending Balance, before tax | (855) | (503) | (855) | (503)
Beginning Balance, deferred taxes | 26 | (146) | 24 | (154)
Changes in value, deferred taxes | 3 | 45 | 15 | 57
Amounts reclassified to earnings, deferred taxes | (5) | (2) | (15) | (6)
Net change, deferred taxes | (2) | 43 |  | 51
Ending Balance, deferred taxes | 24 | (103) | 24 | (103)
Derivative Contracts | Fuel |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax |  | (41) | (2) | (215)
Changes in value, before tax |  | (6) |  | (5)
Amounts reclassified to earnings, before tax |  | 24 | 2 | 197
Net change, before tax |  | 18 | 2 | 192
Ending Balance, before tax |  | (23) |  | (23)
Beginning Balance, deferred taxes |  | (165) | 1 | (102)
Changes in value, deferred taxes |  | 2 |  | 2
Amounts reclassified to earnings, deferred taxes |  | (8) | (1) | (71)
Net change, deferred taxes |  | (6) | (1) | (69)
Ending Balance, deferred taxes |  | (171) |  | (171)
Investments and Other |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, before tax | (16) | 3 | 1 | 3
Changes in value, before tax | 26 | 1 | 9 | 1
Amounts reclassified to earnings, before tax |  | (2) |  | (2)
Net change, before tax | 26 | (1) | 9 | (1)
Ending Balance, before tax | 10 | 2 | 10 | 2
Beginning Balance, deferred taxes | 6 |  | 1 |
Changes in value, deferred taxes | (9) | (1) | (3) | (1)
Amounts reclassified to earnings, deferred taxes |  | $ 1 | (1) | $ 1
Net change, deferred taxes | (9) |  | (4) |
Ending Balance, deferred taxes | (3) |  | (3) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance, net of tax | (844) |  | (829) |
Changes in value, net of tax | 11 |  | (21) |
Amounts reclassified to earnings, net of tax | 9 |  | 26 |
Total other comprehensive income (loss), net | 20 |  | 5 |
Ending Balance, net of tax | $ (824) |  | $ (824) |

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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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