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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2016
Income Tax Disclosure [Abstract] |
Components of U.S. and Foreign Income and Reconciliation between Federal Income Tax Expense at Statutory Rates and Actual Income Tax Expense | The components of U.S. and foreign income before income tax and a reconciliation between the federal income tax expense at statutory rates and the actual income tax expense is as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
(In millions) |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. |  |  | $ 638 |  |  |  | $ 188 |  |  |  | $ 535 |  |  |  | $ 454 |
Foreign |  |  | (82) |  |  |  | 160 |  |  |  | (60) |  |  |  | 294 |
Total |  |  | $ 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 Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income 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 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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