Goodwill (details) - Total Intangibles (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Goodwill and Other Intangible Assets disclosure
Intangible assets not subject to amortization	$ 217	$ 217
Total other intangible assets, gross carrying amount	885	886
Total other intangible assets, accumulated amortization	593	582
Total other intangible assets, net	$ 292	$ 304