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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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- Definition 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 + Details
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- Definition 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 + Details
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