Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 902.0	$ 335.0
Liability Fair Value	1,373.0	563.0
Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	235.0	237.0
Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	25,368.0	23,634.0
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	923.0	863.0
Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	290.0	293.0
Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	30.0	30.0
Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	0.0	0.0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	772.0	771.0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	83.0	12.0
Liability Fair Value	0.0	21.0
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	235.0	237.0
Not Designated as Hedging Instrument \| Credit contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	2.0	2.0
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	26,856.0	25,027.0
Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	783.0	294.0
Liability Fair Value	1,038.0	371.0
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	151.0	92.0
Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	5.0	0.0
Liability Fair Value	0.0	1.0
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	446.0	400.0
Not Designated as Hedging Instrument \| Equity contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	4.0	10.0
Liability Fair Value	28.0	8.0
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	27.0	19.0
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	227.0	60.0
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	52.0	100.0
Not Designated as Hedging Instrument \| Managed custody guarantees
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	26.0	0.0
Discontinued Operations, Held-for-sale
Derivatives, Fair Value [Line Items]
Asset Fair Value	159.0	312.0
Liability Fair Value	198.0	369.0
Discontinued Operations, Held-for-sale \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0.0	0.0
Discontinued Operations, Held-for-sale \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,213.0	2,228.0
Discontinued Operations, Held-for-sale \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	50.0	37.0
Discontinued Operations, Held-for-sale \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,821.0	1,753.0
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	1.0	1.0
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0.0	0.0
Liability Fair Value	0.0	0.0
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	19.0	19.0
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	4.0	1.0
Liability Fair Value	0.0	1.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,212.0	2,227.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	50.0	49.0
Liability Fair Value	55.0	56.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	31.0	18.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	1.0	0.0
Liability Fair Value	0.0	0.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,821.0	1,753.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Equity contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	93.0	254.0
Liability Fair Value	3.0	20.0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	11.0	8.0
Liability Fair Value	0.0	0.0
Discontinued Operations, 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	82.0	217.0
Discontinued Operations, 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	$ 58.0	$ 75.0

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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