Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Interest rate stated in the contractual debt agreement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Term Loan Facilities [Member]	Mar. 31, 2013 U S Dollar 4.5% Due 2023 [Member]	Jan. 31, 2013 U S Dollar 4.5% Due 2023 [Member]	Dec. 31, 2012 U S Dollar 4.5% Due 2023 [Member]	Mar. 31, 2013 U.S. Dollar 7.625% Due 2017 [Member]	Dec. 31, 2012 U.S. Dollar 7.625% Due 2017 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 911	$ 8	$ 500				$ 400
Debt Instrument, Unamortized Discount (Premium), Net	6
Senior Notes, Noncurrent				1,000	1,000	0	0	400
Debt Instrument, Interest Rate, Stated Percentage				4.50%	4.50%		7.625%
Payments of Debt Issuance Costs	15	0
Gains (Losses) on Extinguishment of Debt	38	0
Payments of Debt Extinguishment Costs	23
Write off of Deferred Debt Issuance Cost	9
Long-term Debt, Fair Value	$ 4,267