Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Policies [Abstract]

Summary of Financial Information for Joint Ventures

The following tables present summarized financial information for these joint ventures:

Year Ended December 31			2016		2015
(In millions)
Total assets			$	1,749	$	1,577
Total liabilities				1,444		1,231
Year Ended December 31	2016		2015		2014
Revenues	$	693	$	606	$	491
Net income		80		71		32

Principal Service Lives

The principal service lives used in computing provisions for depreciation are as follows:

	Years
Pipeline equipment		30 to 50
Offshore drilling equipment		15 to 30
Other		3 to 40