Income Taxes Level 4 Net Operating Loss Carrryover (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Significant Change in Unrecognized Tax Benefits, Nature of Event	The Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations for years prior to 2007. The audit of the years 2007-2011 is expected to conclude in 2015, with no material impact on the consolidated financial condition or results of operations. The federal audit of the years 2012 and 2013 began in March 2015 and is expected to be completed in 2016. Management believes that adequate provision has been made in the financial statements for any potential assessments that may result from tax examinations and other tax-related matters for all open tax years.
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 3,188	$ 3,189
Expiring within Tax Years 2016 to 2017 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 6
Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2023
Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2033