Derivative Instruments - Gains (Losses) on Derivatives Not Designated as Hedging (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	$ 796,000,000	$ 543,000,000	$ (1,046,000,000)	$ 1,218,000,000
Investment related gains (losses)
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	2,330,000,000	1,181,000,000	(689,000,000)	2,873,000,000
Investment related gains (losses) | Equity options
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	672,000,000	439,000,000	(909,000,000)	1,288,000,000
Investment related gains (losses) | Futures
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	(3,000,000)	(3,000,000)	13,000,000	(14,000,000)
Investment related gains (losses) | Swap [Member]
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	55,000,000	11,000,000	(20,000,000)	29,000,000
Investment related gains (losses) | Foreign currency forwards
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	(23,000,000)	(1,000,000)	44,000,000	5,000,000
Investment related gains (losses) | Embedded derivatives
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	1,629,000,000	735,000,000	183,000,000	1,565,000,000
Interest sensitive contract benefits | Embedded derivatives
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	(1,534,000,000)	(638,000,000)	(357,000,000)	(1,655,000,000)
Cash flow hedges | Derivatives designated as hedges | Foreign currency swaps
Derivative [Line Items]
Foreign currency swap gain (loss) reclassified to income	$ 0	$ 0	$ 0	$ 0