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Fair Value Measurements Level 4 Pricing Controls, Broker Inputs, and Valuation (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Adjustments to Broker Prices Received |  | 0.00% |  |
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount |  | $ 0 |  | $ 0
Derivative Financial Instruments, Assets [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Measurements, Valuation Techniques |  | Derivative instruments are fair valued using pricing valuation models for OTC derivatives that utilize independent market data inputs, quoted market prices for exchange-traded and OTC-cleared derivatives, or independent broker quotations. Excluding embedded and reinsurance related derivatives, as of December 31, 2015 and 2014, 96% and 96%, respectively, of derivatives, based upon notional values, were priced by valuation models, including discounted cash flow models and option-pricing models that utilize present value techniques, or quoted market prices. The remaining derivatives were priced by broker quotations. |  |
Interest Rate Contract [Member] | 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 |  | $ (30,000,000) |  | $ (29,000,000)
Fair Value Measurements, Valuation Techniques |  | Discounted cash flows |  | Discounted cash flows
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Decrease |  | Decrease
Fair Value Measurements, Significant Assumptions |  | Swap curve beyond 30 years |  | Swap curve beyond 30 years
US GMWB Hedging Instruments [Member] | Variance 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 |  | $ (31,000,000) |  |
Fair Value Measurements, Valuation Techniques |  | Option model |  |
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Increase |  |
Fair Value Measurements, Significant Assumptions |  | Equity volatility |  |
US GMWB Hedging Instruments [Member] | 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 |  | $ 35,000,000 |  | $ 46,000,000
Fair Value Measurements, Valuation Techniques |  | Option model |  | Option model
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Increase |  | Increase
Fair Value Measurements, Significant Assumptions |  | Equity volatility |  | Equity volatility
US GMWB Hedging Instruments [Member] | 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 |  | $ 131,000,000 |  | $ 124,000,000
Fair Value Measurements, Valuation Techniques |  | Discounted cash flows |  | Discounted cash flows
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Increase |  | Increase
Fair Value Measurements, Significant Assumptions |  | Equity volatility |  | Equity volatility
US Macro Hedge Program [Member] | 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 |  | $ 179,000,000 |  | $ 141,000,000
Fair Value Measurements, Valuation Techniques |  | Option model |  | Option model
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Increase |  | Increase
Fair Value Measurements, Significant Assumptions |  | Equity volatility |  | Equity volatility
Long [Member] | Interest Rate Contract [Member] | Interest Rate Swaption [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 |  | $ 8,000,000 | [2] | $ 22,000,000
Fair Value Measurements, Valuation Techniques |  | Option model |  | Option model
Fair Value Measurements, Sensitivity Analysis, Description | [1] | Increase |  | Increase
Fair Value Measurements, Significant Assumptions |  | Interest rate volatility |  | Interest rate volatility
Minimum [Member] | Interest Rate Contract [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] | US GMWB Hedging Instruments [Member] | Variance Swap [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 |  | 19.00% |  |
Minimum [Member] | US GMWB Hedging Instruments [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 |  | 27.00% |  | 22.00%
Minimum [Member] | US GMWB Hedging Instruments [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 |  | 10.00% |  | 10.00%
Minimum [Member] | US Macro Hedge Program [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 |  | 14.00% |  | 27.00%
Minimum [Member] | Long [Member] | Interest Rate Contract [Member] | Interest Rate Swaption [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 |  | 1.00% |  | 1.00%
Maximum [Member] | Interest Rate Contract [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] | US GMWB Hedging Instruments [Member] | Variance Swap [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 |  | 21.00% |  |
Maximum [Member] | US GMWB Hedging Instruments [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 |  | 29.00% |  | 34.00%
Maximum [Member] | US GMWB Hedging Instruments [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 |  | 40.00% |  | 40.00%
Maximum [Member] | US Macro Hedge Program [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] | Long [Member] | Interest Rate Contract [Member] | Interest Rate Swaption [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 |  | 2.00% |  | 1.00%
US Treasury Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  | $ 1,900,000,000 |  | $ 2,500,000,000
[1] | Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table. Changes are based on long positions, unless otherwise noted. Changes in fair value will be inversely impacted for short positions.
[2] | The swaptions presented are purchased options that have the right to enter into a pay-fixed swap.

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- Definition 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 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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