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Tax - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax at U.S. federal statutory rate | $ (118) | $ 137 | $ (201) | $ 313
Foreign income tax rate differential | 3 | (41) | (24) | (87)
State income tax, net of federal benefit | (1) |  | (5) | 3
Nondeductible expenses | 9 | 12 | 21 | 17
Tax benefit of manufacturing deduction |  |  |  | (10)
Foreign dividends, net of foreign tax credits | (24) | 8 | (19) | 15
Tax impact of foreign exchange | 1 | (19) | (7) | (18)
Change in valuation allowance | 11 | 3 | 21 | 6
Tax rate change on temporary differences | (5) | 1 | (3) | (3)
Change in tax reserves | 3 |  | (20) | 69
Other |  | 4 | (2) | (11)
Provision for income taxes | $ (121) | $ 105 | $ (239) | $ 294

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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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