Investments (Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available for sale, due in one year or less, amortized cost	$ 75,295
Available for sale, due after one year through five years, amortized cost	851,732
Available for sale, due after five years through ten years, amortized cost	7,828,092
Available for sale, due after ten years through twenty years, amortized cost	6,494,544
Available for sale, due after twenty years, amortized cost	6,518,227
Available for sale, securities with a single maturity date, amortized cost	21,767,890
Available for sale, amortized cost	26,527,730
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, due in one year or less, fair value	76,482
Available for sale, due after one year through five years, fair value	953,159
Available for sale, due after five years through ten years, fair value	7,720,501
Available for sale, due after ten years through twenty years, fair value	6,472,508
Available for sale, due after twenty years, fair value	6,645,901
Available for sale, securities with a single maturity date, fair value	21,868,551
Available for sale, fair value	26,610,447	24,172,136
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held for investment, due in one year or less, amortized cost	0
Held for investment, due after one year through five years, amortized cost	0
Held for investment, due after five years through ten years, amortized cost	0
Held for investment, due after ten years through twenty years, amortized cost	0
Held for investment, due after twenty years, amortized cost	76,255
Held for investment, securities with a single maturity date, amortized cost	76,255
Held for investment, amortized cost	76,255	76,088
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held for investment, due in one year or less, fair value	0
Held for investment, due after one year through five years, fair value	0
Held for investment, due after five years through ten years, fair value	0
Held for investment, due after ten years through twenty years, fair value	0
Held for investment, due after twenty years, fair value	60,840
Held for investment, securities with a single maturity date, fair value	60,840
Held for investment, fair value	60,840	61,521
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available for sale, securities without a single maturity date, amortized cost	1,895,913
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	1,971,960
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held for investment, securities without a single maturity date, amortized cost	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held for investment, securities without a single maturity date, fair value	0
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available for sale, securities without a single maturity date, amortized cost	1,821,988
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	1,735,460
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held for investment, securities without a single maturity date, amortized cost	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held for investment, securities without a single maturity date, fair value	0
Other Asset Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available for sale, securities without a single maturity date, amortized cost	1,041,939
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	1,034,476
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held for investment, securities without a single maturity date, amortized cost	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held for investment, securities without a single maturity date, fair value	$ 0

Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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