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Derivative Instruments and Hedging Activities (Derivative Instruments Not Designated for Hedge Accounting) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net loss from disposal and impairments of discontinued operations	$ 0	$ (56)	$ (152)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	182	202	29
Net loss from disposal and impairments of discontinued operations	0	72	0
Not Designated as Hedging Instrument | Interest Rate Contract | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	0	(3)	(1)
Not Designated as Hedging Instrument | Interest Rate Contract | Net Equity In Earnings Of Affiliates
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	0	0	(6)
Not Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Net Equity In Earnings Of Affiliates
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	0	(2)	(24)
Not Designated as Hedging Instrument | Foreign Exchange Contract [Member] | Foreign Currency Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	211	146	64
Not Designated as Hedging Instrument | Other Contract | Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	(8)	5	11
Not Designated as Hedging Instrument | Other Contract | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	(16)	(3)	1
Not Designated as Hedging Instrument | Other Contract | Regulated Cost Of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	(5)	(6)	2
Not Designated as Hedging Instrument | Other Contract | Income (Loss) From Operations Of Discontinued Business
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Losses) Recognized in Earnings, Not Designated as Hedge Accounting	$ 0	$ (7)	$ (18)

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+ References

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759

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