Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	$ 42,330	$ 39,663
Derivatives	270	316
Other investments	319	385
Assets held in separate accounts	82,879	81,670
Derivatives	434	403
Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	46,171	43,778
Equity securities	371	196
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	1,786	2,644
Derivatives	270	316
Other investments	360	456
Assets held in separate accounts	82,879	81,670
Short-term debt	1	1
Long-term debt	3,491	3,418
Estimate of Fair Value Measurement \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	434	403
Estimate of Fair Value Measurement \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	143	100
Estimate of Fair Value Measurement \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	45,223	41,035
Estimate of Fair Value Measurement \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	795	877
Estimate of Fair Value Measurement \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	876	872
Estimate of Fair Value Measurement \| Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	177	60
Estimate of Fair Value Measurement \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	7,266	7,262
Estimate of Fair Value Measurement \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	735	776
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	46,171	43,778
Equity securities	371	196
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	1,786	2,644
Derivatives	270	316
Other investments	285	320
Assets held in separate accounts	82,879	81,670
Short-term debt	1	1
Long-term debt	3,043	3,042
Carrying Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	434	403
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	143	100
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	35,331	33,916
Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	795	877
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	914	821
Carrying Value \| Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	177	60
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	6,817	6,878
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	735	776
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	13,555	12,470
Equity securities	4	35
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	504	533
Derivatives	314	305
Other investments	46	42
Assets held in separate accounts	1,473	1,485
Notes Payable	257	320
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	95	75
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,008	923
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	99	104
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	215	217
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,378	1,405
Discontinued Operations, Held-for-sale \| Estimate of Fair Value Measurement \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	996	1,005
Discontinued Operations, Held-for-sale \| Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	13,555	12,470
Equity securities	4	35
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	504	533
Derivatives	314	305
Other investments	46	42
Assets held in separate accounts	1,473	1,485
Notes Payable	219	252
Discontinued Operations, Held-for-sale \| Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	95	75
Discontinued Operations, Held-for-sale \| Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,010	927
Discontinued Operations, Held-for-sale \| Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	106	97
Discontinued Operations, Held-for-sale \| Carrying Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	215	217
Discontinued Operations, Held-for-sale \| Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,264	1,319
Discontinued Operations, Held-for-sale \| Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 996	$ 1,005

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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