Income Tax (Net Operating and Capital Loss Carryforwards for Tax Purposes) (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Foreign Tax Authority [Member]	Dec. 31, 2013 Foreign Tax Authority [Member] Capital Loss Carryforwards [Member]	Dec. 31, 2013 Domestic Country [Member]	Dec. 31, 2013 Domestic Country [Member] Capital Loss Carryforwards [Member]	Dec. 31, 2013 State Country [Member]	Dec. 31, 2013 State Country [Member] Capital Loss Carryforwards [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			$ 1,576		$ 4,153		$ 153
Expiration period for net operating loss carryforwards			Jan. 01, 2014		Jan. 01, 2018		Jan. 01, 2014
Capital Loss Carryforwards [Line Items]
Capital loss carryforwards	$ 1,653	$ 545	$ 991	$ 40		$ 52		$ 0
Expiration period for capital loss carryforwards			Jan. 01, 2015	Jan. 01, 2014		Jan. 01, 2018