Other Commitments and Contingencies (Details) (Synthetic fuels matters, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2009
Synthetic fuels matters
Loss Contingencies [Line Items]
Judgment award	$ 78
Prejudgment interest	55
Total judgment	133
After-tax loss contingency, loss in period	74
Judgment payment	$ 154