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Accumulated Other Comprehensive Income (Loss) - Reclassification of Component of Accumulated Other Comprehensive Income (Loss) Associated with Cash Flow Hedges (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | $ (50) | $ (7) | $ (29)
Operating revenues | $ 3,460 | $ 3,548 | $ 3,425 | $ 3,176 | $ 3,246 | $ 3,360 | $ 3,315 | $ 3,040 | 13,609 | 12,961 | 13,996
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 1,822 | 1,060 | 1,751
Tax (provision) benefit |  |  |  |  |  |  |  |  | (642) | (308) | (413)
Total reclassifications for the period, Net of tax | $ 334 | $ 304 | $ 286 | $ 256 | $ 273 | $ 337 | $ 273 | $ (131) | 1,180 | 752 | 1,338
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (31) | 35 | 8
Tax (provision) benefit |  |  |  |  |  |  |  |  | 12 | (14) | (3)
Total reclassifications for the period, Net of tax |  |  |  |  |  |  |  |  | (19) | 21 | 5
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (10) | (12) | (10)
Treasury Rate Locks [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (1) | (4) | (1)
Foreign Currency Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | $ (20) | $ 51 | 27
Electricity Commodity Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ (8)

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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