Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	$ 39,663	$ 36,897
Derivatives	316	194
Other investments	385	379
Assets held in separate accounts	81,670	69,931
Derivatives	403	164
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	43,778	40,592
Equity securities	196	247
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,644	2,656
Derivatives	316	194
Other investments	320	287
Assets held in separate accounts	81,670	69,931
Short-term debt	1	1
Long-term debt	3,042	3,136
Carrying Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	403	164
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	100	(5)
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	33,916	34,053
Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	877	657
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	821	870
Carrying Value \| Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	60	44
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	6,878	7,281
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	776	814
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	43,778	40,592
Equity securities	196	247
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,644	2,656
Derivatives	316	194
Other investments	456	369
Assets held in separate accounts	81,670	69,931
Short-term debt	1	1
Long-term debt	3,418	3,112
Fair Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	403	164
Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	100	(5)
Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	41,035	37,052
Fair Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	877	652
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	872	854
Fair Value \| Other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	60	44
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	7,262	7,391
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	776	814
Held for sale \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	12,470	10,529
Equity securities	35	25
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	533	734
Derivatives	305	131
Notes receivable	42	25
Other investments	1,485	1,297
Notes Payable	252	222
Held for sale \| Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	75	26
Held for sale \| Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	927	551
Held for sale \| Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	97	106
Held for sale \| Carrying Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	217	82
Held for sale \| Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,319	1,395
Held for sale \| Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,005	1,019
Held for sale \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	12,470	10,529
Equity securities	35	25
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	533	734
Derivatives	305	131
Notes receivable	42	25
Other investments	1,485	1,297
Notes Payable	320	302
Held for sale \| Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	75	26
Held for sale \| Fair Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	923	545
Held for sale \| Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	104	106
Held for sale \| Fair Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	217	82
Held for sale \| Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,405	1,420
Held for sale \| Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 1,005	$ 1,019

Amount, after allowance for credit loss, of accounts and financing receivable. Includes, but is not limited to, notes and loan receivable.

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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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