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Fair Value Measurements Level 4 Pricing Controls, Broker Inputs, and Valuation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Measurement [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate Account Assets	$ 111,634,000,000	$ 118,174,000,000
Fair Value Measurement [Domain] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate Account Assets	201,000,000	140,000,000
Separate Account Assets	$ 115,665,000,000	120,123,000,000
Adjustments to Broker Prices Received	0.00%
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	$ 0	0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ (29,000,000)	$ (30,000,000)
Fair Value Measurements, Valuation Techniques	Discounted cash flows	Discounted cash flows
Fair Value Measurements, Sensitivity Analysis, Description	Decrease	Decrease
Fair Value Measurements, Significant Assumptions	Swap curve beyond 30 years	Swap curve beyond 30 years
Equity Option [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 188,000,000	$ 179,000,000
Fair Value Measurements, Valuation Techniques	Option model	Option model
Fair Value Measurements, Sensitivity Analysis, Description	Increase	Increase
Fair Value Measurements, Significant Assumptions	Equity volatility	Equity volatility
Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 100,000,000	$ 131,000,000
Fair Value Measurements, Valuation Techniques	Discounted cash flows	Discounted cash flows
Fair Value Measurements, Sensitivity Analysis, Description	Increase	Increase
Fair Value Measurements, Significant Assumptions	Equity volatility	Equity volatility
Minimum [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Unobservable Swap Curve	3.00%	3.00%
Minimum [Member] | Equity Option [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	17.00%	14.00%
Minimum [Member] | Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	12.00%	10.00%
Maximum [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Unobservable Swap Curve	3.00%	3.00%
Maximum [Member] | Equity Option [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	28.00%	28.00%
Maximum [Member] | Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	30.00%	40.00%
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Separate Account Assets	$ 1,000,000,000	$ 1,200,000,000

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- Definition

Range of input to the valuation of interest rate swaps that are unobservable due to the swap duration being in excess of the observable swap yield curve.

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Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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-Name Accounting Standards Codification
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-Section 50
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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

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Description of the sensitivity of the fair value measurements to changes in unobservable inputs and the inter-relationships between those inputs as well as how those inter-relationships might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurements.

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The fair value of the assets held by the Entity for the benefit of separate account policyholders.

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