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Investments In Marketable Securities (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Debt securities: |  |  |
Unsecured debentures | $ 665 | $ 719 |
Certificates of deposit | 576 | 873 |
Government debt securities | 31 | 47 |
Other debt securities | 0 | 42 |
Subtotal | 1,272 | 1,681 |
Equity securities: |  |  |
Mutual funds | 67 | 62 |
Common stock | 1 | 7 |
Subtotal | 68 | 69 |
Total available-for-sale | 1,340 | 1,750 |
Equity securities: |  |  |
Mutual funds | 12 | 10 |
Total trading | 12 | 10 |
Total | 1,352 | 1,760 |
Held-to-maturity securities | 4 | 0 |
Total marketable securities | 1,356 | 1,760 |
Footnotes to Marketable Securities Detail Table [Abstract] |  |  |
Amortized cost of commmon stock available-for-sale | 4 | 6 |
Other than temporary impairment on AFS securities | 3 |  |
Gain Loss On Marketable Securities |  |  |
Gains included in earnings that relate to trading securities held at the reporting date | 1 | 0 | 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 | 0 | 0 | 2
Proceeds from sales of available-for-sale securities | 6,119 | 5,852 | 4,440
Gross realized gains on sales | 3 | 2 | 3
Debt securities with future maturities greater than ten years | 42 |  |
Level 1 [Member] |  |  |
Debt securities: |  |  |
Unsecured debentures | 0 | 0 |
Certificates of deposit | 0 | 0 |
Government debt securities | 0 | 0 |
Other debt securities | 0 | 0 |
Subtotal | 0 | 0 |
Equity securities: |  |  |
Mutual funds | 0 | 1 |
Common stock | 1 | 7 |
Subtotal | 1 | 8 |
Total available-for-sale | 1 | 8 |
Equity securities: |  |  |
Mutual funds | 12 | 10 |
Total trading | 12 | 10 |
Total | 13 | 18 |
Level 2 [Member] |  |  |
Debt securities: |  |  |
Unsecured debentures | 665 | 719 |
Certificates of deposit | 576 | 873 |
Government debt securities | 31 | 47 |
Other debt securities | 0 | 0 |
Subtotal | 1,272 | 1,639 |
Equity securities: |  |  |
Mutual funds | 67 | 61 |
Common stock | 0 | 0 |
Subtotal | 67 | 61 |
Total available-for-sale | 1,339 | 1,700 |
Equity securities: |  |  |
Mutual funds | 0 | 0 |
Total trading | 0 | 0 |
Total | 1,339 | 1,700 |
Level 3 [Member] |  |  |
Debt securities: |  |  |
Unsecured debentures | 0 | 0 |
Certificates of deposit | 0 | 0 |
Government debt securities | 0 | 0 |
Other debt securities | 0 | 42 |
Subtotal | 0 | 42 |
Equity securities: |  |  |
Mutual funds | 0 | 0 |
Common stock | 0 | 0 |
Subtotal | 0 | 0 |
Total available-for-sale | 0 | 42 |
Equity securities: |  |  |
Mutual funds | 0 | 0 |
Total trading | 0 | 0 |
Total | $ 0 | $ 42 |

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