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Investments In Marketable Securities (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Debt securities: |  |  |  |  |
Unsecured debentures | $ 440 |  | $ 440 |  | $ 665
Certificates of deposit | 338 |  | 338 |  | 576
Government debt securities | 26 |  | 26 |  | 31
Subtotal | 804 |  | 804 |  | 1,272
Equity securities: |  |  |  |  |
Mutual funds | 52 |  | 52 |  | 67
Common stock | 1 |  | 1 |  | 1
Subtotal | 53 |  | 53 |  | 68
Total available-for-sale | 857 |  | 857 |  | 1,340
Equity securities: |  |  |  |  |
Mutual funds | 12 |  | 12 |  | 12
Total trading | 12 |  | 12 |  | 12
TOTAL | 869 |  | 869 |  | 1,352
Held-to-maturity Securities | 4 |  | 4 |  | 4
Total marketable securities | 873 |  | 873 |  | 1,356
Footnotes to Marketable Securities Detail Table [Abstract] |  |  |  |  |
Amortized cost of commmon stock available-for-sale | 1 |  | 1 |  | 4
Gain Loss On Marketable Securities |  |  |  |  |
Gains included in earnings that relate to trading securities held at the reporting date | 0 | (2) | 0 | (1) |
Unrealized gains (losses) on available-for-sale securities included in other comprehensive income | (1) | (1) | (1) | (4) |
Proceeds from sales of available-for-sale securities | 1,513 | 1,134 | 5,160 | 4,218 |
Gross realized gains on sales | 0 | 1 | 1 | 5 |
Level 1 |  |  |  |  |
Debt securities: |  |  |  |  |
Unsecured debentures | 0 |  | 0 |  | 0
Certificates of deposit | 0 |  | 0 |  | 0
Government debt securities | 0 |  | 0 |  | 0
Subtotal | 0 |  | 0 |  | 0
Equity securities: |  |  |  |  |
Mutual funds | 0 |  | 0 |  | 0
Common stock | 1 |  | 1 |  | 1
Subtotal | 1 |  | 1 |  | 1
Total available-for-sale | 1 |  | 1 |  | 1
Equity securities: |  |  |  |  |
Mutual funds | 12 |  | 12 |  | 12
Total trading | 12 |  | 12 |  | 12
TOTAL | 13 |  | 13 |  | 13
Level 2 |  |  |  |  |
Debt securities: |  |  |  |  |
Unsecured debentures | 440 |  | 440 |  | 665
Certificates of deposit | 338 |  | 338 |  | 576
Government debt securities | 26 |  | 26 |  | 31
Subtotal | 804 |  | 804 |  | 1,272
Equity securities: |  |  |  |  |
Mutual funds | 52 |  | 52 |  | 67
Common stock | 0 |  | 0 |  | 0
Subtotal | 52 |  | 52 |  | 67
Total available-for-sale | 856 |  | 856 |  | 1,339
Equity securities: |  |  |  |  |
Mutual funds | 0 |  | 0 |  | 0
Total trading | 0 |  | 0 |  | 0
TOTAL | 856 |  | 856 |  | 1,339
Level 3 |  |  |  |  |
Debt securities: |  |  |  |  |
Unsecured debentures | 0 |  | 0 |  | 0
Certificates of deposit | 0 |  | 0 |  | 0
Government debt securities | 0 |  | 0 |  | 0
Subtotal | 0 |  | 0 |  | 0
Equity securities: |  |  |  |  |
Mutual funds | 0 |  | 0 |  | 0
Common stock | 0 |  | 0 |  | 0
Subtotal | 0 |  | 0 |  | 0
Total available-for-sale | 0 |  | 0 |  | 0
Equity securities: |  |  |  |  |
Mutual funds | 0 |  | 0 |  | 0
Total trading | 0 |  | 0 |  | 0
TOTAL | $ 0 |  | $ 0 |  | $ 0

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 + Details
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- Definition The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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