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Level 4- Significant Unobservable Inputs - Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 35,924	$ 36,964
CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,311	3,336
Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	12,634	12,804
Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	11,544	12,485
RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	3,086	3,044
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,919	1,952
Significant Unobservable Inputs (Level 3) | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		1
Significant Unobservable Inputs (Level 3) | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	33	69
Significant Unobservable Inputs (Level 3) | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	515	520
Significant Unobservable Inputs (Level 3) | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	16	17
Significant Unobservable Inputs (Level 3) | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	1,233	$ 1,230
Significant Unobservable Inputs (Level 3) | Minimum | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate		18.00%
Significant Unobservable Inputs (Level 3) | Maximum | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate		22.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	21	$ 56
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	277	251
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	16	17
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805)	$ 1,163	$ 1,215
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	9.00%	9.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	112.00%	103.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	199.00%	192.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Minimum | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	6.00%	24.00%
Constant prepayment rate	1.00%	1.00%
Constant default rate	0.00%	0.00%
Loss severity	0.00%	0.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	1040.00%	1040.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	768.00%	1000.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	240.00%	250.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Maximum | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	335.00%	351.00%
Constant prepayment rate	25.00%	25.00%
Constant default rate	9.00%	9.00%
Loss severity	100.00%	100.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | CMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	389.00%	400.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | Corporate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	197.00%	242.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	218.00%	219.00%
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Weighted Average [Member] | RMBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Spread	69.00%	74.00%
Constant prepayment rate	7.00%	6.00%
Constant default rate	4.00%	4.00%
Loss severity	59.00%	66.00%
Long | Significant Unobservable Inputs (Level 3) | Interest Rate Swaption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 2	$ 1
Long | Significant Unobservable Inputs (Level 3) | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 1
Long | Significant Unobservable Inputs (Level 3) | Minimum | Interest Rate Swaption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	3.00%	2.00%
Long | Significant Unobservable Inputs (Level 3) | Minimum | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	20.00%
Long | Significant Unobservable Inputs (Level 3) | Maximum | Interest Rate Swaption
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	3.00%	2.00%
Long | Significant Unobservable Inputs (Level 3) | Maximum | Equity options
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assumptions, Expected Volatility Rate	27.00%

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

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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.

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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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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

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