Other Financial Data (Other Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Other Assets, Noncurrent [Abstract]
Intangible assets, net of accumulated amortization of $1,147 and $947	$ 48	$ 246
Long-term receivables, net of allowances of $10 and $1	37	251
Other	209	237
Other assets, total	294	734
Intangible assets, accumulated amortization	1,114	947
Long-term receivables, allowances	$ 10	$ 1