Fair Value of Assets and Liabilities (Level 3 by Pricing Source) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate account assets	$ 44,101,699		$ 46,626,828
Total liabilities	3,112,411
Receivables from parents and affiliates	60,490		44,643
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other long-term investments	95,191		486
Reinsurance recoverable	2,996,154		748,005
Subtotal excluding separate account assets	5,996,564		4,163,198
Separate account assets	44,101,699	[1]	46,626,828	[1]
Total assets	50,098,263		50,790,026
Future policy benefits	3,112,411	[2]	778,226	[2]
Total liabilities			799,984
Receivables from parents and affiliates	41,068		25,418
Cash equivalents	225
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	0		505
Other long-term investments	633		486
Reinsurance recoverable	2,996,154		748,005
Total assets	3,175,926		915,928
Future policy benefits	3,112,411		778,226
Total liabilities	3,112,411		778,226
Receivables from parents and affiliates	22,320		6,347
Cash equivalents	225
Fair Value, Inputs, Level 3 [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	0	[3]	192	[3]
Other long-term investments	0	[3]	0	[3]
Reinsurance recoverable	2,996,154	[3]	748,005	[3]
Total assets	3,095,588	[3]	842,927	[3]
Future policy benefits	3,112,411	[3]	778,226	[3]
Total liabilities	3,112,411	[3]	778,226	[3]
Receivables from parents and affiliates	0	[3]	0	[3]
Cash equivalents	225	[3]
Fair Value, Inputs, Level 3 [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	0	[4]	313	[4]
Other long-term investments	633	[4]	486	[4]
Reinsurance recoverable	0	[4]	0	[4]
Total assets	80,338	[4]	73,001	[4]
Future policy benefits	0	[4]	0	[4]
Total liabilities	0	[4]	0	[4]
Receivables from parents and affiliates	22,320	[4]	6,347	[4]
Cash equivalents	0	[4]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other long-term investments	633		486
Reinsurance recoverable	2,996,154		748,005
Subtotal excluding separate account assets	3,175,926		915,928
Separate account assets	0	[1]	0	[1]
Total assets	3,175,926		915,928
Future policy benefits	3,112,411	[2]	778,226	[2]
Total liabilities	3,112,411		778,226
Receivables from parents and affiliates	22,320		6,347
Cash equivalents	225
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	116,070		96,796
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	99,209	[3]	94,730	[3]
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	16,861	[4]	2,066	[4]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	40,524		63,789
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	0	[3]	0	[3]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	40,524	[4]	63,789	[4]
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	0		0
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	0	[3]	0	[3]
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	$ 0	[4]	$ 0	[4]

[1] Separate account assets represent segregated funds that are invested for certain customers. Investment risks associated with market value changes are borne by the customers, except to the extent of minimum guarantees made by the Company with respect to certain accounts. Separate account liabilities are not included in the above table as they are reported at contract value and not fair value in the Company’s Statement of Financial Position.

[2] As of December 31, 2014, the net embedded derivative liability position of $3,112 million includes $55 million of embedded derivatives in an asset position and $3,167 million of embedded derivatives in a liability position. As of December 31, 2013, the net embedded derivative liability position of $778 million includes $245 million of embedded derivatives in an asset position and $1,023 million of embedded derivatives in a liability position.

[3] Represents valuations reflecting both internally-derived and market inputs. See below for additional information related to internally-developed valuation for significant items in the above table.

[4] Represents unadjusted prices from independent pricing-services and independent indicative broker quotes where pricing inputs are not readily available.