Fair Value of Financial Instruments #1 (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Carrying Value
Marketable Securities
Trading securities	$ 285	$ 259
Available-for-sale securities	2	3
Derivatives	(2)	(1)
Long-term debt, including current portion	(5,930)	(3,935)
Fair Value
Marketable Securities
Trading securities	285	259
Available-for-sale securities	2	3
Derivatives	(2)	(1)
Long-term debt, including current portion	$ (6,358)	$ (4,834)