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Common stock transactions (Details) (Common stock, USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended	1 Months Ended
	Dec. 30, 2011	Aug. 03, 2012	Apr. 06, 2012 Controlling shareholder Buck Holdings, L.P.
Common stock transactions
Common stock repurchase authorization	$ 500
Remaining authorization under the repurchase program		15
Shares acquired under share repurchase program from Buck Holdings, L.P.			6,817,311
Value of shares acquired under share repurchase program from Buck Holdings, L.P.			$ 300

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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