Changes In Accounting Principles (Narrative) (Details) (3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
Sep. 30, 2008 years	Oct. 01, 2011
3.25% Convertible Senior Unsecured Notes Due October 15, 2013 [Member]
Accounting Principles [Line Items]
Maturity year	2013
Interest rate	3.25%	3.25%
Debt instrument, interest rate, effective percentage	8.26%
Discount on note	$ 92
Offsetting after tax amount recorded to capital in excess of par value	$ 56
Discount accretion term	5

Accounting Principles [Line Items]

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Debt instrument maturity year

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Discount Accretion Term

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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-Publisher FASB

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The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

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Net increase or decrease in the carrying amount of the debt instrument for the period for reasons other than accrued but unpaid interest, additional borrowings, forgiveness and repayments.

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Interest rate stated in the contractual debt agreement.

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