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Income Taxes - Components of U.S. and Foreign Income and Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income (loss) before income tax: |  |  |  |
Income (loss) before income tax, U.S. | $ 638 | $ 188 | $ 535 | $ 454
Income (loss) before income tax, Foreign | (82) | 160 | (60) | 294
Income (loss) before income tax | 556 | 348 | 475 | 748
Income tax expense at statutory rate | 194 | 122 | 166 | 262
Increase (decrease) in income tax expense resulting from: |  |  |  |
Exempt investment income | (28) | (34) | (92) | (92)
Foreign related tax differential | 2 | (27) | 102 | (32)
Amortization of deferred charges associated with intercompany rig sales to other tax jurisdictions |  | 1 |  | 42
Taxes related to domestic affiliate | 1 | 5 | 2 | (1)
Partnership earnings not subject to taxes | (9) | (6) | (37) | (26)
Unrecognized tax benefit | (2) | (4) | 8 | 1
Other | 5 | 9 | 22 | 16
Income tax expense | $ 163 | $ 66 | $ 171 | $ 170

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: 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)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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