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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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