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Fair Value Measurements Other Segments Fair Value (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member] | Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 1 [Member] | Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member] | Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 2 [Member] | Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member] | Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Level 3 [Member] | Jun. 30, 2013 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member] | Dec. 31, 2012 Other Segments and Holding Company [Member] Recurring measurement [Member] Total fair value [Member] | Jun. 30, 2013 Property, plant and equipment | Jun. 30, 2012 Property, plant and equipment | Jun. 30, 2013 Intangible assets | Jun. 30, 2012 Intangible assets
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable equity and debt securities | $ 22 |  | $ 1 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 0 |  | $ 22 |  | $ 1 |  |  |  |  |
Trading securities | 0 |  | 0 |  | 0 |  | 0 |  | 114 |  | 60 |  | 114 |  | 60 |  |  |  |  |
Derivative contracts, at fair value (asset) | 0 | [1] | 0 | [1] | 71 | [1] | 1 | [1] | 0 | [1] | 21 | [1] | 71 | [1] | 22 | [1] |  |  |  |
Fair value of investment and derivative assets | 22 |  | 1 |  | 71 |  | 1 |  | 114 |  | 81 |  | 207 |  | 83 |  |  |  |  |
Fair Value of Level 3 Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23 | 29 | 0 | 62
Recognized Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 19 | 0 | 15
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 0 |  | 0 |  | 43 |  | 1 |  | 0 |  | 0 |  | 43 |  | 1 |  |  |  |  |
Derivative contracts at fair value (liability) | 0 | [2] | 0 | [2] | 12 | [2] | 89 | [2] | 0 | [2] | 0 | [2] | 12 | [2] | 89 | [2] |  |  |  |
Fair value of derivative and other liabilities | $ 0 |  | $ 0 |  | $ 55 |  | $ 90 |  | $ 0 |  | $ 0 |  | $ 55 |  | $ 90 |  |  |  |  |
[1] | Amounts are classified within other assets in our consolidated balance sheets.
[2] | Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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