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Business Changes, Risks, Uncertainties and Accounting Developments Details (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended	4 Months Ended
	May 08, 2013	Mar. 31, 2013	May 06, 2013
Significant Transactions [Line Items]
Common stock repurchases		$ 39
Common Stock
Significant Transactions [Line Items]
Common stock repurchases (in shares)		1,900,000	5,600,000
Common stock repurchases		39	115
Common stock repurchased, average price per share		$ 20.46	$ 20.29
Stock repurchase program, additional authorized amount	115
Stock repurchase program, total authorized amount	$ 315

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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