Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 137	$ 148
Liability Fair Value	34	181
Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	17,478	17,286
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	632	559
Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	98	154
Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	201	771
Designated as Hedging Instrument \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	35	35
Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	620	533
Designated as Hedging Instrument \| Derivatives \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Designated as Hedging Instrument \| Derivatives \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	10	0
Liability Fair Value	20	52
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	19,280	18,769
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	12	26
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	98	154
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	9	12
Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	15	117
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	(80)	(21)
Not Designated as Hedging Instrument \| Managed custody guarantees
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	201	771
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	117	117
Liability Fair Value	76	20
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Not Designated as Hedging Instrument \| Derivatives \| Equity contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	1	9
Liability Fair Value	1	7
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	10
Liability Fair Value	$ 2	$ 6

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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+ 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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 860
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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