Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative Assets
Derivative Assets	$ 489	$ 711
Collateral adjustment	(6)	(2)
Derivative assets, current	56	129
Derivative assets, noncurrent	46	54
Derivative Liabilities
Derivative Liabilities	(601)	(705)
Collateral adjustment	36	36
Derivative liabilities, current	(85)	(57)
Derivative liabilities, noncurrent	(99)	(86)
Current derivative assets
Derivative Assets
Derivative Assets	359	570
Counterparty netting	(299)	(441)
Collateral adjustment	(4)	0
Noncurrent derivative assets
Derivative Assets
Derivative Assets	130	141
Counterparty netting	(82)	(85)
Collateral adjustment	(2)	(2)
Current derivative liabilities
Derivative Liabilities
Derivative Liabilities	(408)	(521)
Counterparty netting	299	441
Collateral adjustment	24	23
Noncurrent derivative liabilities
Derivative Liabilities
Derivative Liabilities	(193)	(184)
Counterparty netting	82	85
Collateral adjustment	$ 12	$ 13

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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