Income Taxes (Net Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Internal Revenue Service (IRS) [Member]
Net Operating Loss Carryforwards	$ 1,066	$ 1,116
Tax Credit Carryforward	154	221
State and Local Jurisdiction [Member]
Net Operating Loss Carryforwards	2,779	2,958
Tax Credit Carryforward	$ 7	$ 7