Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	$ 131	$ 137
Derivatives, Liability Fair Value	156	34
Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	193	201
Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	16,559	17,478
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	706	632
Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	88	98
Designated as Hedging Instrument \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	35	35
Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	648	620
Designated as Hedging Instrument \| Cash flow hedges \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Designated as Hedging Instrument \| Cash flow hedges \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	6	10
Derivatives, Liability Fair Value	22	20
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	193	201
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	18,178	19,280
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	58	12
Not Designated as Hedging Instrument \| Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Notional Amount	88	98
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	9	9
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	15	15
Not Designated as Hedging Instrument \| Reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	(41)	(80)
Not Designated as Hedging Instrument \| Managed Custody Guarantees [Member]
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	0	0
Derivatives, Liability Fair Value	2	2
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	113	117
Derivatives, Liability Fair Value	156	76
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	1	0
Derivatives, Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Derivatives \| Equity contract
Derivatives, Fair Value [Line Items]
Derivatives, Asset Fair Value	2	1
Derivatives, Liability Fair Value	$ 2	$ 1

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-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
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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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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