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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Federal income tax at U.S. statutory rate | $ (918) | $ (206) | $ 1,223
Foreign income tax rate differential | 32 | (110) | (261)
Goodwill impairment | 271 | 462 |
Nondeductible expenses | 30 | 66 | 24
Foreign dividends, net of foreign tax credits | (25) | 28 | 132
Tax rate change on timing differences | (8) | (45) | (2)
Change in tax reserve | 11 | 69 | (11)
Prior years taxes | (29) | (47) | (11)
Tax impact on foreign exchange | (4) | (46) | 28
Change in deferred tax valuation allowance | 476 | 15 | (83)
Other | (43) | (8) |
Total income tax provision | $ (207) | $ 178 | $ 1,039

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- Definition Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from 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 10 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32672-109319 Reference 2: 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 Reference 3: 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)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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