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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Effective Portion of Cash Flow Hedges) (Details) - Cash Flow Hedging - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion |  | $ (22) | $ 12 | $ (73)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion |  | (51) | (45) | (77)
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 15 | 3 | 182
AOCI before tax expected increase (decrease) next 12 months |  | (58) |  |
Interest Rate Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion |  | (66) | (35) | (103)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion |  | (82) | (101) | (116)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net |  | 3 | (1) | (6)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring | [1] | (13) | 0 | 0
Cross Currency Interest Rate Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion |  | 31 | 21 | (20)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion |  | 34 | 8 | (24)
Foreign Exchange Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion |  | (5) | (4) | 10
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion |  | (20) | (8) | 32
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 1 | 19 | 211
Commodity Contract [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion |  | 18 | 30 | 40
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion |  | 17 | 56 | 31
Gain (Loss) on Derivative Instruments, Net, Pretax |  | $ 14 | $ (16) | $ (29)
[1] | Cash flow hedge was discontinued because it was probable the forecasted transaction will not occur.

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- Definition The pre-tax accumulated other comprehensive income (loss) expected to be recognized as an increase (decrease) to income from continuing operations before income taxes over the next twelve months as of the balance sheet date. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and 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 (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + 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 (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + 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 (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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