Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair value
Fixed income securities	$ 59,044,000,000	$ 57,170,000,000
Short-term investments	4,256,000,000	3,027,000,000
Derivative instruments	0	0
Gross unrealized Gains
Fixed income securities	2,847,000,000	993,000,000
Short-term investments	0	0
Derivative instruments	0	0
Gross unrealized Losses
Fixed income securities	(96,000,000)	(957,000,000)
Short-term investments	0	0
Derivative instruments	(3,000,000)	(3,000,000)
Unrealized net gains (losses)
Fixed income securities	2,751,000,000	36,000,000
Short-term investments	0	0
Derivative instruments	(3,000,000)	(3,000,000)
EMA limited partnerships	(4,000,000)	0
Unrealized net capital gains and losses, pre-tax	2,744,000,000	33,000,000
Amounts recognized for:
Insurance reserves	(126,000,000)	0
DAC and DSI	(224,000,000)	(33,000,000)
Amounts recognized	(350,000,000)	(33,000,000)
Deferred income taxes	(507,000,000)	(2,000,000)
Total unrealized net capital gains and losses	$ 1,887,000,000	$ (2,000,000)