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Investments In Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2011
Investments In Marketable Securities Tables [Abstract] |
Marketable Securities By Type Table |
|  |  | December 31,
|  |  | 2011 |  | 2010
|  |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  |  | Total
|  |  | (in millions)
AVAILABLE-FOR-SALE:(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Unsecured debentures(2) |  | $ | - |  | $ | 665 |  | $ | - |  | $ | 665 |  | $ | - |  | $ | 719 |  | $ | - |  | $ | 719
| Certificates of deposit(2) |  |  | - |  |  | 576 |  |  | - |  |  | 576 |  |  | - |  |  | 873 |  |  | - |  |  | 873
| Government debt securities |  |  | - |  |  | 31 |  |  | - |  |  | 31 |  |  | - |  |  | 47 |  |  | - |  |  | 47
| Other |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 42 |  |  | 42
| Subtotal |  |  | - |  |  | 1,272 |  |  | - |  |  | 1,272 |  |  | - |  |  | 1,639 |  |  | 42 |  |  | 1,681
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Mutual funds |  |  | - |  |  | 67 |  |  | - |  |  | 67 |  |  | 1 |  |  | 61 |  |  | - |  |  | 62
| Common stock |  |  | 1 |  |  | - |  |  | - |  |  | 1 |  |  | 7 |  |  | - |  |  | - |  |  | 7
| Subtotal |  |  | 1 |  |  | 67 |  |  | - |  |  | 68 |  |  | 8 |  |  | 61 |  |  | - |  |  | 69
Total available-for-sale |  |  | 1 |  |  | 1,339 |  |  | - |  |  | 1,340 |  |  | 8 |  |  | 1,700 |  |  | 42 |  |  | 1,750
TRADING: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Mutual funds |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  | 10 |  |  | - |  |  | - |  |  | 10
Total trading |  |  | 12 |  |  | - |  |  | - |  |  | 12 |  |  | 10 |  |  | - |  |  | - |  |  | 10
TOTAL |  | $ | 13 |  | $ | 1,339 |  | $ | - |  | $ | 1,352 |  | $ | 18 |  | $ | 1,700 |  | $ | 42 |  | $ | 1,760
Held-to-maturity securities |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  | -
Total marketable securities |  |  |  |  |  |  |  |  |  |  | $ | 1,356 |  |  |  |  |  |  |  |  |  |  | $ | 1,760
Pre-Tax Gains And Losses On Available For Sale And Trading Securities |
|  |  | 2011 |  | 2010 |  | 2009
|  |  | (in millions)
Gains included in earnings that relate to trading securities held at |  |  |  |  |  |  |  |  |
| the reporting date |  | $ | 1 |  | $ | - |  | $ | 1
Unrealized gains (losses) on available-for-sale securities included in |  |  |  |  |  |  |  |  |
| other comprehensive income |  |  | 2 |  |  | 2 |  |  | 10
Gains reclassified out of other comprehensive income into earnings |  |  | - |  |  | - |  |  | 2
Proceeds from sales of available-for-sale securities |  |  | 6,119 |  |  | 5,852 |  |  | 4,440
Gross realized gains on sales |  |  | 3 |  |  | 2 |  |  | 3

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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 5 -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 12 -Subparagraph a, 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.M) -URI http://asc.fasb.org/extlink&oid=6784337&loc=d3e87990-122713 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph d -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 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section M Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7, 13, 16, 22 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558 + Details
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