Long-Term Debt - Junior Subordinated Notes Issued to Capital Trust and Preferred Securities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Junior subordinated notes issued to capital trusts [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,031	$ 1,031
Stated percentage	5.91%
Basis spread	1.926%
Description of variable interest rate	3 Month Libor Plus
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Stated percentage	5.91%
Basis spread	1.926%
Loan agreements with affiliates	$ 1,000
Description of variable interest rate	3 Month Libor Plus