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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2018
Assets accounted for at fair value on a recurring basis
Total fixed maturities	$ 45,035	$ 42,148
Equity securities, at fair value	1,438	1,657	$ 1,000
Derivative assets	23	12
Short-term investments	3,283	2,921
Total assets accounted for at fair value on a recurring basis	49,779	46,738
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(84)	(78)
Contingent consideration		(22)
Total liabilities accounted for at fair value on a recurring basis	(84)	(100)
Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	21	11
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		(1)
Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(14)	(2)
Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(70)	(60)
Equity derivatives
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		(15)
Asset backed securities ("ABS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	1,564	1,476
Collateralized loan obligations ("CLOs")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	2,780	2,183
Commercial mortgage-backed securities ("CMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	4,484	4,338
Corporate
Assets accounted for at fair value on a recurring basis
Total fixed maturities	20,273	17,396
Foreign government/government agencies
Assets accounted for at fair value on a recurring basis
Total fixed maturities	919	1,123
Municipal
Assets accounted for at fair value on a recurring basis
Total fixed maturities	9,503	9,498
Residential mortgage-backed securities ("RMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	4,107	4,869
U.S. Treasuries
Assets accounted for at fair value on a recurring basis
Total fixed maturities	1,405	1,265
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets accounted for at fair value on a recurring basis
Total fixed maturities	529	330
Equity securities, at fair value	872	1,401
Derivative assets	0	0
Short-term investments	2,663	1,028
Total assets accounted for at fair value on a recurring basis	4,064	2,759
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Contingent consideration		0
Total liabilities accounted for at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity derivatives
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset backed securities ("ABS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations ("CLOs")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities ("CMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government/government agencies
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities ("RMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasuries
Assets accounted for at fair value on a recurring basis
Total fixed maturities	529	330
Significant Observable Inputs (Level 2)
Assets accounted for at fair value on a recurring basis
Total fixed maturities	42,801	40,404
Equity securities, at fair value	496	183
Derivative assets	23	12
Short-term investments	590	1,878
Total assets accounted for at fair value on a recurring basis	43,910	42,477
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(84)	(63)
Contingent consideration		0
Total liabilities accounted for at fair value on a recurring basis	(84)	(63)
Significant Observable Inputs (Level 2) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	21	11
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		(1)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(14)	(2)
Significant Observable Inputs (Level 2) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	1	1
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	(70)	(60)
Significant Observable Inputs (Level 2) | Equity derivatives
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		0
Significant Observable Inputs (Level 2) | Asset backed securities ("ABS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	1,564	1,461
Significant Observable Inputs (Level 2) | Collateralized loan obligations ("CLOs")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	2,420	2,088
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities ("CMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	4,407	4,329
Significant Observable Inputs (Level 2) | Corporate
Assets accounted for at fair value on a recurring basis
Total fixed maturities	19,392	16,664
Significant Observable Inputs (Level 2) | Foreign government/government agencies
Assets accounted for at fair value on a recurring basis
Total fixed maturities	913	1,120
Significant Observable Inputs (Level 2) | Municipal
Assets accounted for at fair value on a recurring basis
Total fixed maturities	9,503	9,498
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities ("RMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	3,726	4,309
Significant Observable Inputs (Level 2) | U.S. Treasuries
Assets accounted for at fair value on a recurring basis
Total fixed maturities	876	935
Significant Unobservable Inputs (Level 3)
Assets accounted for at fair value on a recurring basis
Total fixed maturities	1,705	1,414
Equity securities, at fair value	70	73
Derivative assets	0	0
Short-term investments	30	15
Total assets accounted for at fair value on a recurring basis	1,805	1,502
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	(15)
Contingent consideration		(22)
Total liabilities accounted for at fair value on a recurring basis	0	(37)
Significant Unobservable Inputs (Level 3) | Credit derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		0
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Interest rate derivatives
Assets accounted for at fair value on a recurring basis
Derivative assets	0	0
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities	0	0
Significant Unobservable Inputs (Level 3) | Equity derivatives
Liabilities accounted for at fair value on a recurring basis
Derivative liabilities		(15)
Significant Unobservable Inputs (Level 3) | Asset backed securities ("ABS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	15
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations ("CLOs")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	360	95
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities ("CMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	77	9
Significant Unobservable Inputs (Level 3) | Corporate
Assets accounted for at fair value on a recurring basis
Total fixed maturities	881	732
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies
Assets accounted for at fair value on a recurring basis
Total fixed maturities	6	3
Significant Unobservable Inputs (Level 3) | Municipal
Assets accounted for at fair value on a recurring basis
Total fixed maturities	0	0
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities ("RMBS")
Assets accounted for at fair value on a recurring basis
Total fixed maturities	381	560
Significant Unobservable Inputs (Level 3) | U.S. Treasuries
Assets accounted for at fair value on a recurring basis
Total fixed maturities	$ 0	$ 0

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