Debt (Extinguishment of debt) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Extinguishment of Debt [Line Items]
Repurchase price		$ 5		$ 1,285
Principal	814	5		1,273
Loss	(25)	(3)		(28)	[1]	7
Aggregate Costs Of Debt Retirement				16
Write off of Deferred Debt Issuance Cost				(12)
Write Off Previously Terminated Derivative Transaction	4			4
7 3/4 percent Senior Subordinated Notes
Extinguishment of Debt [Line Items]
Repurchase price		0	[2]	490	[2]
Principal		0	[2]	484	[2]
Loss		0	[1]	(14)	[1]
7 percent Senior Subordinated Notes
Extinguishment of Debt [Line Items]
Repurchase price		0	[2]	267	[2]
Principal		0	[2]	261	[2]
Loss		0	[1]	(8)	[1]
6 1/2 percent Senior Notes
Extinguishment of Debt [Line Items]
Repurchase price		0	[2]	435	[2]
Principal		0	[2]	435	[2]
Loss		0	[1]	(4)	[1]
1 7/8 percent Convertible Senior Subordinated Notes
Extinguishment of Debt [Line Items]
Repurchase price		0		93
Principal		0		93
Loss		0	[1]	(2)	[1]
Convertible subordinated notes - four percent
Extinguishment of Debt [Line Items]
Repurchase price		5	[3]	0	[3]
Principal		5	[3]	0	[3]
Loss				0	[1]
Repayments of Convertible Debt		12
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt		7
ABL Facility [Member]
Extinguishment of Debt [Line Items]
Write off of Deferred Debt Issuance Cost		(3)
Maximum [Member]
Extinguishment of Debt [Line Items]
Aggregate Costs Of Debt Retirement		1
Maximum [Member] | Convertible subordinated notes - four percent
Extinguishment of Debt [Line Items]
Loss		$ 1

[1] The amount of the loss is calculated as the difference between the net carrying amount of the related security and the repurchase price. The net carrying amounts of the securities are less than the principal amounts due to capitalized debt issuance costs and any original issue discount. Aggregate costs of less than $1 and $16 were written off in the years ended December 31, 2011 and 2010, respectively, in connection with the repurchases/redemptions. The $16 of aggregate costs written off in the year ended December 31, 2010 was comprised of $12 of write-offs of debt issuance costs and a $4 write-off of a previously terminated derivative transaction. The losses are reflected in interest expense, net in our consolidated statements of income.

[2] Prior to December 31, 2010, we repurchased and retired the entire principal amounts of these debt securities, which are not reflected in our consolidated balance sheets as of December 31, 2011 and 2010.

[3] As discussed above, based on the price of our common stock during 2011, holders of the 4 percent Convertible Senior Notes had the right to convert the notes during each of the quarters in 2011. We paid a total of $12 to settle the $5 principal amount of the 4 percent Convertible Senior Notes that were settled in 2011. The $5 repurchase price represents the repurchase price for the debt component of the settled securities. In connection with the settlement, as discussed above, additional paid-in capital was reduced by $7, reflecting the excess of the cash transferred upon settlement over the $5 principal amount of the converted notes.