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Financial Instruments (Unaudited) Other Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Cash and Cash Equivalents [Line Items] |  |  |  |
Credit Derivative, Maximum Exposure, Undiscounted | $ 333 us-gaap_CreditDerivativeMaximumExposureUndiscounted |  |  |
Cash and cash equivalents | 549 us-gaap_CashAndCashEquivalentsAtCarryingValue | 464 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,342 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,985 us-gaap_CashAndCashEquivalentsAtCarryingValue
Time Deposits [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Cash and cash equivalents | $ 17 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember | $ 48 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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