Investments In Marketable Securities (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Debt securities:
Unsecured debentures	$ 566		$ 566		$ 727
Certificates of deposit	537		537		877
Government debt securities	46		46		47
Other debt securities	40		40		42
Subtotal	1,189		1,189		1,693
Equity securities:
Mutual funds	68		68		62
Common stock	2		2		7
Subtotal	70		70		69
Total available-for-sale	1,259		1,259		1,762
Equity securities:
Mutual funds	12		12		10
Total trading	12		12		10
TOTAL	1,271		1,271		1,772
Footnotes to Marketable Securities Detail Table Abstract
Amortized cost of commmon stock available-for-sale	4		4		6
Debt securities with future maturities greater than ten years	40		40
Gain Loss On Marketable Securities
Gains included in earnings that relate to trading securities held at the reporting date	0	1	1	1
Unrealized losses on available-for-sale securities included in other comprehensive income	(1)	(3)	(3)	(10)
Proceeds from sales of available-for-sale securities	1,867	2,247	3,124	3,210
Gross realized gains on sales	3	1	4	1
Quoted Market Prices in Active Market for Identical Assets (Level 1)
Debt securities:
Unsecured debentures	0		0		0
Certificates of deposit	0		0		0
Government debt securities	0		0		0
Other debt securities	0		0		0
Subtotal	0		0		0
Equity securities:
Mutual funds	0		0		1
Common stock	2		2		7
Subtotal	2		2		8
Total available-for-sale	2		2		8
Equity securities:
Mutual funds	12		12		10
Total trading	12		12		10
TOTAL	14		14		18
Significant Other Observable Inputs (Level 2)
Debt securities:
Unsecured debentures	566		566		727
Certificates of deposit	537		537		877
Government debt securities	46		46		47
Other debt securities	0		0		0
Subtotal	1,149		1,149		1,651
Equity securities:
Mutual funds	68		68		61
Common stock	0		0		0
Subtotal	68		68		61
Total available-for-sale	1,217		1,217		1,712
Equity securities:
Mutual funds	0		0		0
Total trading	0		0		0
TOTAL	1,217		1,217		1,712
Significant Unobservable Inputs (Level 3)
Debt securities:
Unsecured debentures	0		0		0
Certificates of deposit	0		0		0
Government debt securities	0		0		0
Other debt securities	40		40		42
Subtotal	40		40		42
Equity securities:
Mutual funds	0		0		0
Common stock	0		0		0
Subtotal	0		0		0
Total available-for-sale	40		40		42
Equity securities:
Mutual funds	0		0		0
Total trading	0		0		0
TOTAL	$ 40		$ 40		$ 42

Total marketable debt and equity financial instruments measured at fair value on a recurring basis (trading securities and securities available-for-sale).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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