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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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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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