Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	$ 734	$ 235
Derivatives, Liability Fair Value	997	341
Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	205	182
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	19,176	17,621
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	722	706
Equity contract
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	59	63
Designated as Hedging Instrument \| Interest rate contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	23	23
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	652	652
Derivatives, Asset Fair Value	69	10
Derivatives, Liability Fair Value	0	18
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	205	182
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	2	2
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	20,341	18,640
Derivatives, Asset Fair Value	646	210
Derivatives, Liability Fair Value	793	261
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	70	54
Derivatives, Asset Fair Value	3	0
Derivatives, Liability Fair Value	0	1
Not Designated as Hedging Instrument \| Equity contract
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	59	63
Derivatives, Asset Fair Value	1	4
Derivatives, Liability Fair Value	0	3
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	15	11
Derivatives, Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	176	33
Not Designated as Hedging Instrument \| Reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	23
Not Designated as Hedging Instrument \| Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	$ 26	$ 0

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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- Definition

Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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- Definition

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.

+ References

No definition available.

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