Investments (Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available for sale, due in one year or less, amortized cost	$ 65,783
Available for sale, due after one year through five years, amortized cost	1,483,940
Available for sale, due after five years through ten years, amortized cost	8,523,008
Available for sale, due after ten years through twenty years, amortized cost	7,251,089
Available for sale, due after twenty years, amortized cost	7,637,740
Available for sale, securities with a single maturity date, amortized cost	24,961,560
Available for sale, amortized cost	30,205,046	26,527,730
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, due in one year or less, fair value	67,404
Available for sale, due after one year through five years, fair value	1,638,259
Available for sale, due after five years through ten years, fair value	8,738,123
Available for sale, due after ten years through twenty years, fair value	7,914,212
Available for sale, due after twenty years, fair value	8,581,756
Available for sale, securities with a single maturity date, fair value	26,939,754
Available for sale, fair value	32,445,202	26,610,447
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	76,432
Held for investment, securities with a single maturity date, amortized cost	76,432
Held for investment, amortized cost	76,432us-gaap_HeldToMaturitySecurities	76,255us-gaap_HeldToMaturitySecurities
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	75,838
Held for investment, securities with a single maturity date, fair value	75,838
Held for investment, fair value	75,838	60,840
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	1,616,846
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	1,751,345
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	2,720,294
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	2,807,620
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	906,346
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available for sale, securities without a single maturity date, fair value	946,483
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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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of investment in available-for-sale debt securities with a single maturity date.

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Amount of investment in available-for-sale debt securities with a single maturity date at cost, after adjustments, including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in the statement of income and fair value hedge accounting adjustments.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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 available-for-sale debt securities at fair value that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the fair value over several maturity groupings.

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

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the fifth through tenth fiscal year following the latest fiscal year.

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Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of investment in held-to-maturity debt securities with a single maturity date, after other than temporary impairment (OTTI) accretion.

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