Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Subsequent Events Subsequent Events (Details) - USD ($) $ in Millions		1 Months Ended		3 Months Ended
	May 01, 2018	Apr. 30, 2018	Mar. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017
Subsequent Event [Line Items]
Cash proceeds					$ 4	$ 78
Principal payments on long-term debt					$ 0	$ 485
6.875% Senior notes
Subsequent Event [Line Items]
Stated interest rate			6.875%		6.875%
West Eagle Ford Shale
Subsequent Event [Line Items]
Cash proceeds			$ 22
Minimum \| Forecast \| West Eagle Ford Shale
Subsequent Event [Line Items]
Gain on disposal				$ (75)
Maximum \| Forecast \| West Eagle Ford Shale
Subsequent Event [Line Items]
Gain on disposal				$ (85)
Subsequent event \| 6.875% Senior notes
Subsequent Event [Line Items]
Stated interest rate	6.875%
Principal payments on long-term debt	$ 450
Subsequent event \| West Eagle Ford Shale
Subsequent Event [Line Items]
Cash proceeds		$ 81