GEOGRAPHIC AREAS - Long-Lived Assets by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets - U.S.	$ 5,510	$ 5,682	$ 5,946
Total	6,910	7,064	7,415
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	728	745	827
Other foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 672	$ 637	$ 642