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Accumulated Other Comprehensive Loss - Tax Impact (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | $ 0 | $ (4) | $ 20
Amounts reclassified from accumulated other comprehensive (income) loss, tax | 5 | 12 | (14)
Available-for-Sale Securities. [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 2 | 3 | (1)
Amounts reclassified from accumulated other comprehensive (income) loss, tax | (1) | 0 | 0
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive (income) loss, tax | 0 | 0 | 0
Post - Retirement Benefit Obligation [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss) before reclassifications, tax | 1 | 0 | 1
Amounts reclassified from accumulated other comprehensive (income) loss, tax | $ 0 | $ 1 | $ 0

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79507043&loc=d3e39076-109324 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
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