Acquisitions and Dispositions (Assets Held For Sale) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Significant Acquisitions and Disposals [Line Items]
Total assets held for sale		$ 746
Total liabilities associated with assets held for sale		279
International Energy [Member] | Discontinued Operations, Held-for-sale [Member]
Significant Acquisitions and Disposals [Line Items]
Cash and cash equivalents		474
Receivables, net		188
Inventory		65
Other		19
Total current assets held for sale		746
Cost		2,859
Accumulated depreciation and amortization		(930)
Net Property, Plant and Equipment		1,929
Goodwill		271
Other		213
Total noncurrent assets held for sale		2,413
Total assets held for sale		3,159
Accounts Payable		51
Taxes accrued		60
Current maturities of long-term debt		48
Other		120
Total current liabilities associated with assets held for sale		279
Long-term Debt		653
Deferred income taxes		157
Other		90
Total noncurrent liabilities associated with assets held for sale		900
Total liabilities associated with assets held for sale		$ 1,179
Goodwill, Period Increase (Decrease)	$ 7
Disposal Group, Including Discontinued Operation, Goodwill	$ 278