Income Taxes (Tables)

6 Months Ended

Jun. 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       June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
(In millions)
Income (loss) before income tax:
U.S.		$    (142)		$    129		$    (103)		$    266
Foreign		(134)		166		22		134
Total		$    (276)		$    295		$      (81)		$    400
Income tax expense (benefit) at statutory rate		$      (97)		$    103		$      (28)		$    140
Increase (decrease) in income tax expense resulting from:
Exempt investment income		(33)		(29)		(64)		(58)
Foreign related tax differential		63		(32)		23		(5)
Valuation allowance		77				77
Amortization of deferred charges associated with intercompany rig sales to other tax jurisdictions				4				41
Taxes related to domestic affiliate		(2)		4		1		(6)
Partnership earnings not subject to taxes		(11)		(7)		(28)		(20)
Unrecognized tax benefit		5		2		10		5
Other		10		3		17		7
Income tax expense		$        12		$    48		$         8		$    104