Derivative Instruments - Gains (Losses) on Derivatives Not Designated as Hedging (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	$ 1,095,000,000	$ 355,000,000	$ 49,000,000	$ 1,573,000,000
Investment related gains (losses)
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	1,648,000,000	620,000,000	959,000,000	3,493,000,000
Investment related gains (losses) | Equity options
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	606,000,000	77,000,000	(303,000,000)	1,365,000,000
Investment related gains (losses) | Futures
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	50,000,000	(3,000,000)	63,000,000	(17,000,000)
Investment related gains (losses) | Swap [Member]
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	29,000,000	8,000,000	9,000,000	37,000,000
Investment related gains (losses) | Foreign currency forwards
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	(114,000,000)	42,000,000	(70,000,000)	47,000,000
Investment related gains (losses) | Embedded derivatives
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	1,077,000,000	496,000,000	1,260,000,000	2,061,000,000
Interest sensitive contract benefits | Embedded derivatives
Derivative [Line Items]
Total gains (losses) for derivatives not designated as hedges	(553,000,000)	(265,000,000)	(910,000,000)	(1,920,000,000)
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