Quarterly Financial Data Quarterly Financial Data (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012
Diluted earnings Per Share [Member]
Pre-tax non-cash gains Equity Investee Strategic Alliance	$ 0.11
Earnings Before Income Taxes [Member]
Pre-tax non-cash gains Equity Investee Strategic Alliance	342,000,000
Net Earnings [Member]
Pre-tax non-cash gains Equity Investee Strategic Alliance	$ 222,000,000