Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	$ 37,584	$ 39,663
Derivatives	875	316
Other investments	392	385
Assets held in separate accounts	68,937	81,670
Derivatives	1,068	403
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	41,994	43,778
Equity securities	176	196
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	3,296	2,644
Derivatives	875	316
Other investments	324	320
Assets held in separate accounts	68,937	81,670
Short-term debt	1	1
Long-term debt	3,042	3,042
Carrying Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	1,068	403
Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	52	100
Carrying Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	34,989	33,916
Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	856	877
Carrying Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	799	821
Carrying Value \| Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	253	60
Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	6,969	6,878
Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	763	776
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	41,994	43,778
Equity securities	176	196
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	3,296	2,644
Derivatives	875	316
Other investments	405	456
Assets held in separate accounts	68,937	81,670
Short-term debt	1	1
Long-term debt	3,120	3,418
Fair Value \| Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	1,068	403
Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	52	100
Fair Value \| Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	42,861	41,035
Fair Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	829	877
Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	839	872
Fair Value \| Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	253	60
Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	7,087	7,262
Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	763	776
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	12,052	12,470
Equity securities	32	35
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	471	533
Derivatives	148	305
Other investments	46	42
Other investments	1,212	1,485
Notes Payable	252	252
Discontinued Operations, Held-for-sale \| Carrying Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	58	75
Discontinued Operations, Held-for-sale \| Carrying Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	1,016	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	103	97
Discontinued Operations, Held-for-sale \| Carrying Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	82	217
Discontinued Operations, Held-for-sale \| Carrying Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,310	1,319
Discontinued Operations, Held-for-sale \| Carrying Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,006	1,005
Discontinued Operations, Held-for-sale \| Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, available-for-sale, at fair value	12,052	12,470
Equity securities	32	35
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	471	533
Derivatives	148	305
Other investments	46	42
Other investments	1,212	1,485
Notes Payable	262	320
Discontinued Operations, Held-for-sale \| Fair Value \| Embedded derivative on reinsurance
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	58	75
Discontinued Operations, Held-for-sale \| Fair Value \| Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	986	923
Discontinued Operations, Held-for-sale \| Fair Value \| Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	110	104
Discontinued Operations, Held-for-sale \| Fair Value \| IUL
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities	82	217
Discontinued Operations, Held-for-sale \| Fair Value \| Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	1,340	1,405
Discontinued Operations, Held-for-sale \| Fair Value \| Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 1,006	$ 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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