GEOGRAPHIC AREAS - Long-Lived Assets by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 9,438	$ 6,923	$ 7,084
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	8,116	5,523	5,702
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	652	728	745
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 670	$ 672	$ 637