Goodwill (details) (USD $) In Millions	9 Months Ended
	Sep. 30, 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	893	840
Total other intangible assets	449	502
Estimated intangible asset amortization expense, remainder of 2011	16
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