Background And Basis Of Presentation (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2011	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity method investment, ownership percentage		27.00%		27.00%	27.00%
Planned share repurchase program	$ 1,000,000,000
Repurchase Program Expected Completion Date					Dec. 31, 2012
Shares repurchased during period		2.0		11.9	23.7
Shares repurchased during period, value		66,000,000		360,000,000	688,000,000	1,327,000,000
Average price of repurchased shares, per share		$ 32.37		$ 30.16	$ 29.01
Subsidiary or Equity Method Investee [Line Items]
Understatement of Earnings from Equity Method Investment			342,000,000
Understatement of Net Earnings and Total Comprehensive Earnings			222,000,000
Understatement of Diluted Earnings Per Share			$ 0.11
Understatement of Equity Method Investment			342,000,000
Understatement of Long term Liability for Deferred taxes			120,000,000
Understatement of Total Stockholders Equity			222,000,000
Impact to Net Operating, Financing or Investing Activities Cash Flows			$ 0