Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 335.0	$ 210.0
Liability Fair Value	563.0	203.0
Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	23,634.0	23,518.0
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	863.0	752.0
Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	293.0	189.0
Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	237.0	280.0
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	30.0	42.0
Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	771.0	731.0
Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	0.0	0.0
Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	12.0	13.0
Liability Fair Value	21.0	22.0
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	25,027.0	26,011.0
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	92.0	21.0
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	400.0	329.0
Not Designated as Hedging Instrument \| Within fixed maturity investments
Derivatives, Fair Value [Line Items]
Asset Fair Value	19.0	16.0
Liability Fair Value	0.0	0.0
Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	60.0	44.0
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	100.0	(5.0)
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	237.0	280.0
Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	294.0	179.0
Liability Fair Value	371.0	137.0
Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	1.0	0.0
Not Designated as Hedging Instrument \| Derivatives \| Equity contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	10.0	2.0
Liability Fair Value	8.0	2.0
Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	2.0	3.0
Held for sale
Derivatives, Fair Value [Line Items]
Asset Fair Value	312.0	140.0
Liability Fair Value	369.0	161.0
Held for sale \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,228.0	2,134.0
Held for sale \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	37.0	22.0
Held for sale \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,753.0	1,427.0
Held for sale \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0.0	1.0
Held for sale \| Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1.0	1.0
Held for sale \| Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	19.0	13.0
Held for sale \| Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	0.0	0.0
Held for sale \| Designated as Hedging Instrument \| Derivatives \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	1.0	1.0
Liability Fair Value	1.0	0.0
Held for sale \| Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,227.0	2,151.0
Held for sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	18.0	9.0
Held for sale \| Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,753.0	1,427.0
Held for sale \| Not Designated as Hedging Instrument \| Within fixed maturity investments
Derivatives, Fair Value [Line Items]
Asset Fair Value	8.0	9.0
Liability Fair Value	0.0	0.0
Held for sale \| Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	217.0	82.0
Held for sale \| Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	75.0	26.0
Held for sale \| Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0.0	1.0
Held for sale \| Not Designated as Hedging Instrument \| Derivatives \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	49.0	39.0
Liability Fair Value	56.0	51.0
Held for sale \| Not Designated as Hedging Instrument \| Derivatives \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	0.0	0.0
Held for sale \| Not Designated as Hedging Instrument \| Derivatives \| Equity contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	254.0	91.0
Liability Fair Value	20.0	2.0
Held for sale \| Not Designated as Hedging Instrument \| Derivatives \| Credit contracts
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	$ 0.0	$ 0.0

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.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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