Debt Obligations (Tables)

9 Months Ended

Sep. 30, 2011

Debt Obligations [Abstract]

Changes In Debt Obligations

	December 31, 2010			Additions			Payments, Conversions, Accretion and Other			September 30, 2011
	(in millions)
3.75% convertible notes due October 22, 2012 (net of discount)(1)	$	—		$	—		$	—		$	—
2.50% convertible senior notes due August 15, 2013(2)		388			—			11			399
4.00% senior unsecured notes due January 15, 2015 (net of discount)(3)		398			—			1			399
5.55% senior unsecured notes due January 15, 2020 (net of discount)(3)		598			—			—			598
5.25% senior unsecured notes due January 16, 2018 (net of discount)(3)		367			—			—			367
$450 million senior unsecured term loan facility credit agreement due September 19, 2016 (average interest rate of 1.60% for the period September 19, 2011 through September 30, 2011)(4)		—			450			—			45 0
$700 million senior unsecured term loan facility credit agreement repaid September 2011 (average interest rate of 2.25% for the period January 1, 2011 through September 19, 2011)(5)		570			—			(570	)		—
Total debt obligations		2,321			450			(558	)		2,213
Less current portion		(140	)		(45	)		140			(45	)
Total long-term debt obligations	$	2,181		$	405		$	(418	)	$	2,168

⁽¹⁾  As of September 30, 2011 and December 31, 2010, approximately $0.5 million aggregate principal amount of the 3.75% convertible notes remained outstanding.

⁽²⁾  See "2.50% Convertible Senior Notes" below for further discussion.

⁽³⁾  See "Senior Unsecured Notes" below for further discussion.

⁽⁴⁾  See "2011 Credit Facility" below for further discussion.

⁽⁵⁾  See "2010 Credit Facility" below for further discussion.

Changes In The Liability And Equity Components Of Convertible Senior Notes

	Liability Component							Equity Component
	(in millions)							(in millions)
	Principal Balance		Unamortized Debt Discount			Net Carrying Amount		Gross Equity Component		Deferred Taxes		Net Equity Component
December 31, 2010	$	428	$	40		$	388	$	80	$	32	$	48
Accretion of debt discount		—		(11	)		11		—		—		—
September 30, 2011	$	428	$	29		$	399	$	80	$	32	$	48

Interest Expense Recognized On 2.25% Convertible Senior Notes In The Condensed Consolidated Statements Of Income

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
	(in millions)
Components of interest expense recognized on the 2013 Convertible Notes
Accretion of debt discount	$	4	$	4	$	11	$	11
Contractual interest		3		2		8		7
Total interest expense recognized on the 2013 Convertible Notes	$	7	$	6	$	19	$	18