Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Fair Value	$ 836	$ 335
Liability Fair Value	1,292	563
Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	239	237
Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	22,107	23,634
Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	926	863
Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	282	293
Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	30	30
Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	794	771
Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	67	12
Liability Fair Value	1	21
Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	239	237
Not Designated as Hedging Instrument \| Credit contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	2	2
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	25,194	25,027
Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	734	294
Liability Fair Value	940	371
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	132	92
Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	1	1
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	422	400
Not Designated as Hedging Instrument \| Equity contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	8	10
Liability Fair Value	6	8
Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	27	19
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	193	60
Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	132	100
Not Designated as Hedging Instrument \| Managed custody guarantees
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	17	0
Discontinued Operations, Held-for-sale
Derivatives, Fair Value [Line Items]
Asset Fair Value	269	312
Liability Fair Value	348	369
Discontinued Operations, Held-for-sale \| Credit contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0	0
Discontinued Operations, Held-for-sale \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,218	2,228
Discontinued Operations, Held-for-sale \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	66	37
Discontinued Operations, Held-for-sale \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,850	1,753
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Interest rate contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	1	1
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
Liability Fair Value	0	0
Discontinued Operations, Held-for-sale \| Designated as Hedging Instrument \| Foreign exchange contracts \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional Amount	32	19
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	1
Liability Fair Value	0	1
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional Amount	2,216	2,227
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Interest rate contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	47	49
Liability Fair Value	51	56
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	34	18
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Foreign exchange contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	0	0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Notional Amount	1,850	1,753
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Equity contracts \| Derivatives
Derivatives, Fair Value [Line Items]
Asset Fair Value	207	254
Liability Fair Value	18	20
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Fixed maturities
Derivatives, Fair Value [Line Items]
Asset Fair Value	11	8
Liability Fair Value	0	0
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Within products
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	177	217
Discontinued Operations, Held-for-sale \| Not Designated as Hedging Instrument \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Asset Fair Value	0	0
Liability Fair Value	$ 102	$ 75

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

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