Related Party Transactions (Related Party Net Interest And Other Financial Income) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Interest expense
Interest capitalized			(8)
Related party net interest and other financial income	0	1	35
PFD [Member]
Related Party Transaction [Line Items]
Dividend income, PFD Preferred Stock			35
Interest expense			3
Marathon Oil Companies [Member]
Related Party Transaction [Line Items]
Interest expense			$ 5