Summary of Significant Accounting Policies (Life Settlement Contracts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Life Settlement Contracts, Fair Value Method, Number of Contracts, Fiscal Year Maturity [Abstract]
Life settlement contracts, fair value method, number of contracts, maturing in next twelve months	60
Life settlement contracts, fair value method, number of contracts, maturing in year two	60
Life settlement contracts, fair value method, number of contracts, maturing in year three	50
Life settlement contracts, fair value method, number of contracts, maturing in year four	50
Life settlement contracts, fair value method, number of contracts, maturing in year five	40
Life settlement contracts, fair value method, number of contracts, maturing after year five	364
Life settlement contracts, fair value method, number of contracts	624
Life settlement contracts, fair value, maturing in next twelve months	$ 13
Life settlement contracts, fair value, maturing in year two	11
Life settlement contracts, fair value, maturing in year three	9
Life settlement contracts, fair value, maturing in year four	8
Life settlement contracts, fair value, maturing in year five	7
Life settlement contracts, fair value, maturing after year five	40
Life settlement contracts, fair value	88	100
Life settlement contracts, fair value method, face value, maturing in next twelve months	39
Life settlement contracts, fair value method, face value, maturing in year two	35
Life settlement contracts, fair value method, face value, maturing in year three	32
Life settlement contracts, fair value method, face value, maturing in year four	29
Life settlement contracts, fair value method, face value, maturing in year five	26
Life settlement contracts, fair value method, face value, maturing after year five	217
Life settlement contracts, fair value method, face value	$ 378