Fair Value Measurements - Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 331	$ 128
Other investments	42	40
Assets held in separate accounts	75,898	67,323
Derivatives liabilities	395	99
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	27,499	25,034
Equity securities	90	57
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	1,486	1,207
Derivative assets	331	128
Other investments	42	40
Assets held in separate accounts	75,898	67,323
Deposit liabilities	76	77
Derivatives liabilities	395	99
Short-term Debt	1	1
Long-term debt	4	4
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivative on reinsurance	26	(80)
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	26,250	26,068
Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	828	658
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	316	333
Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	10	11
Carrying Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	57	4
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,682	4,918
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	207	210
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	27,499	25,034
Equity securities	90	57
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreement	1,486	1,207
Derivative assets	331	128
Other investments	42	40
Assets held in separate accounts	75,898	67,323
Deposit liabilities	152	122
Derivatives liabilities	395	99
Short-term Debt	1	1
Long-term debt	4	4
Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivative on reinsurance	26	(80)
Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	32,949	29,108
Fair Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	826	652
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	383	354
Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	10	11
Fair Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	57	4
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,925	4,983
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 207	$ 210

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Carrying amount of liabilities as of the balance sheet date pertaining to amounts received by the insurer or reinsurer from the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Line items represent financial 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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Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of investments classified as other.

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Amount of asset at fair value held for benefit of separate account policyholder.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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