Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Collateral Fixed Maturity Securities [Member]	Dec. 31, 2013 Collateral Fixed Maturity Securities [Member]	Sep. 30, 2013 Collateral Received Fixed Maturity Securities [Member]	Dec. 31, 2012 Collateral Received Fixed Maturity Securities [Member]	Sep. 30, 2014 Reported Value Measurement [Member]	Dec. 31, 2013 Reported Value Measurement [Member]	Sep. 30, 2014 Portion at Fair Value Measurement [Member]	Dec. 31, 2013 Portion at Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 13,413,102,000	$ 11,697,394,000	$ 72,000,000	$ 57,000,000
Available-for-sale Securities	14,190,456,000	12,110,755,000	74,000,000	58,000,000	126,000,000	94,000,000
Assets Held-in-trust							$ 9,350,000,000	$ 7,843,000,000	$ 9,917,000,000	$ 8,125,000,000