Subsequent Event (Narrative) (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Jun. 30, 2014 Subsidiaries	Dec. 31, 2013 Subsidiaries	Jun. 30, 2014 8.375% subordinated notes due 2014 Subsidiaries	Dec. 31, 2013 8.375% subordinated notes due 2014 Subsidiaries	Sep. 30, 2014 8.375% subordinated notes due 2014 Subsidiaries Redemption of Debt	Jul. 15, 2014 8.375% subordinated notes due 2014 Subsidiaries Redemption of Debt	Jul. 22, 2014 3.80% subordinated notes due 2026 Parent Company Debt Issuance
Subsequent Event [Line Items]
Par value of subordinated notes redeemed						$ 150
Par value of senior notes issued							250
Stated interest rate			8.375%	8.375%		8.375%	3.80%
Carrying value of notes redeemed	1,638	1,898	182	183
Gain on early redemption of notes					$ 32