OTHER FINANCIAL DATA - U.S. Treasury Grants Receivable (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
U S Treasury Grants Receivable Disclosure [Abstract]
U.S. Treasury grants receivable	$ 236	$ 258	[1]
Reduction of grants receivable due to sequestration	23
Reduction in tax benefit due to sequestration	$ 5

[1] Derived from audited financial statements.