Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	$ 48,329	$ 47,394
Equity securities, available-for-sale	380	258
Derivatives	397	737
Other investments	47	47
Assets held in separate accounts	77,605	66,185
Derivatives	149	297
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	53,434	51,868
Equity securities, available-for-sale	380	258
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	3,315	3,073
Derivatives	397	737
Notes Receivable	350	350
Other investments	47	47
Assets held in separate accounts	77,605	66,185
Short-term debt	337	0
Long-term debt	3,123	3,550
Carrying Value \| Other derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	149	297
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	129	79
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	33,986	33,871
Carrying Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	501	473
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,275	1,330
Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	40	42
Carrying Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	159	81
Carrying Value \| GMWBL/GMWB/GMAB
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	10	18
Carrying Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	97	150
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	8,686	8,003
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,888	1,943
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	53,434	51,868
Equity securities, available-for-sale	380	258
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	3,315	3,073
Derivatives	397	737
Notes Receivable	445	432
Other investments	55	57
Assets held in separate accounts	77,605	66,185
Short-term debt	337	0
Long-term debt	3,478	3,738
Fair Value \| Other derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	149	297
Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	129	79
Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	38,553	38,368
Fair Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	501	470
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,285	1,337
Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	40	42
Fair Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	159	81
Fair Value \| GMWBL/GMWB/GMAB
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	10	18
Fair Value \| Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	97	150
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	8,748	8,185
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,888	1,943
Held for sale \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	23,380	23,470
Equity securities, available-for-sale	23	16
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	1,323	1,447
Derivatives	1,514	976
Other investments	34	0
Assets held in separate accounts	28,894	30,934
Held for sale \| Carrying Value \| Other derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	350	350
Derivatives	782	174
Held for sale \| Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	19,272	19,443
Held for sale \| Carrying Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	601	0
Held for sale \| Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	2,651	2,549
Held for sale \| Carrying Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	2,242	1,987
Held for sale \| Carrying Value \| GMWBL/GMWB/GMAB
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,158	1,512
Held for sale \| Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,212	3,722
Held for sale \| Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	17	19
Held for sale \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	23,380	23,470
Equity securities, available-for-sale	23	16
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	1,323	1,447
Derivatives	1,514	976
Other investments	34	0
Assets held in separate accounts	28,894	30,934
Held for sale \| Fair Value \| Other derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes payable	445	432
Derivatives	782	174
Held for sale \| Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	18,901	19,193
Held for sale \| Fair Value \| Funding agreements with fixed maturities and guaranteed investment contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	601	0
Held for sale \| Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	2,908	2,783
Held for sale \| Fair Value \| FIA
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	2,242	1,987
Held for sale \| Fair Value \| GMWBL/GMWB/GMAB
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,158	1,512
Held for sale \| Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,215	3,776
Held for sale \| Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 17	$ 19

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Amount of debt securities categorized neither as held-to-maturity nor 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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Fair value portion of liability related to investment contracts for example, but not limited to, guaranteed investment contract or annuities.

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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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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Amount of investments classified as other.

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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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