Income Taxes Level 4 Capital Loss Carryover (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	$ 494	$ 491
Operating Loss Carryforwards, Valuation Allowance		172
Unrecognized Tax Benefits	48
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 federal audit of the years 2007-2011 is expected to conclude in 2015 and it is reasonably possible the Company may be able to reduce part of or the entire amount of the unrecognized tax benefits within the next 12 months. Apart from the possible reduction in unrecognized tax benefits, management does not expect the conclusion of the federal audit for the 2007-2011 years will have a 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.
Expiring Tax Year 2019 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	491
Expiring Tax Year 2020 [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	3
Before Tax [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	$ 173	$ 172