Other Items (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net Interest and Other Financing [Abstract]
Interest income	$ 6		$ 13		$ 12
Interest expense(a)	(307)	[1]	(244)	[1]	(228)	[1]
Income on interest rate swaps	9		7		10
Interest capitalized	21		12		103
Total interest	(271)		(212)		(103)
Net foreign currency gains (losses)	16		4		24
Write off of contingent proceeds	(4)		0		(7)
Other	(15)		(11)		(21)
Total other	(3)		(7)		(4)
Net interest and other	(274)		(219)		(107)
Interest payments made on our behalf			1		10
Aggregate foreign currency gains losses [Abstract]
Net interest and other	16		4		24
Provision for income taxes	105		(80)		57
Aggregate foreign currency gains (losses)	$ 121		$ (76)		$ 81

[1] Excludes $1 million and $10 million paid by United States Steel in 2012 and 2011 on assumed debt.