Financial Instruments, Derivatives and Hedging Activities (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair value of assets and liabilities
Long -term debt, fair value	$ 1,813	$ 1,914
Recurring fair value measurements | Total
Fair value of assets and liabilities
Available for sale	4	3
Derivatives assets	20	25
Derivatives liabilities	32	45
Long -term debt, fair value	1,813	1,914
Recurring fair value measurements | Level 1
Fair value of assets and liabilities
Available for sale	4	3
Derivatives assets		5
Derivatives liabilities	22	24
Recurring fair value measurements | Level 2
Fair value of assets and liabilities
Derivatives assets	20	20
Derivatives liabilities	10	21
Long -term debt, fair value	$ 1,813	$ 1,914