Commercial mortgage loans, Percentage

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Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

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The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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Value of investments transferred to the entity's investments in noncash transactions.

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Amount of restructured debt contingently payable based on the occurrence of future events or circumstances.

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Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments (Narrative) (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Investment [Line Items]
Commercial mortgage loans, Percentage	100.00%		100.00%		100.00%
Net change in unrealized gains (losses) from trading account assets	$ 2,300,000	$ (100,000)	$ 10,700,000	$ 15,500,000
Commercial mortgage and other loans, Acquired	0	0	0	0
Commercial mortgage and other loans, Sold	0	0	0	0
Troubled debt restructuring, Commitment to borrowers	0		0		$ 0
Securities sold under agreements to repurchase	0		0		0
Fixed maturities
Investment [Line Items]
Gross Unrealized Gains	211,863,000		211,863,000		147,795,000
Gross unrealized losses	361,558,000		361,558,000		603,330,000
Gross unrealized losses of twelve months or more concentrated in various sectors	281,341,000		281,341,000		12,683,000
NAIC high or highest quality rating \| Fixed maturities
Investment [Line Items]
Gross unrealized losses	356,600,000		356,600,000		594,900,000
NAIC other than high or highest quality rating \| Fixed maturities
Investment [Line Items]
Gross unrealized losses	4,900,000		4,900,000		8,400,000
Corporate securities
Investment [Line Items]
Gross unrealized losses of twelve months or more concentrated in various sectors	$ 281,300,000		$ 281,300,000		$ 12,700,000
California
Investment [Line Items]
Commercial mortgage loans, Percentage	28.00%		28.00%
Texas
Investment [Line Items]
Commercial mortgage loans, Percentage	12.00%		12.00%
New Jersey
Investment [Line Items]
Commercial mortgage loans, Percentage	6.00%		6.00%
Affiliated Entity \| Commercial mortgage and other loans
Investment [Line Items]
Commercial mortgage and other loans received from related parties	$ 0	$ 0	$ 0	$ 580,000,000