Goodwill (details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Goodwill and Other Intangible Assets disclosure
Goodwill, other	$ 27	$ 27
Intangible assets not subject to amortization	216	216
Total other intangible assets, gross carrying amount	1,342	1,342
Total other intangible assets, accumulated amortization	909	840
Total other intangible assets	433	502
Estimated intangible asset amortization expense, 2012	52
Estimated intangible asset amortization expense, 2013	45
Estimated intangible asset amortization expense, 2014	43
Estimated intangible asset amortization expense, 2015	23
Estimated intangible asset amortization expense, 2016	$ 9