Derivative Instruments Level 4 Non-qualifying Strategies for Hedge Accounting (Details) - USD ($) $ in Millions	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		$ 35,535	$ 37,756
Derivative, Fair Value, Net		100	(438)
Invested Assets Suppoting Modco		798	861
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (27)	187	(217)	$ (138)
Derivative, Notional Amount		35,535	36,088
Derivative, Fair Value, Net		100	(426)
Not Designated as Hedging Instrument [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(24)	165	(212)	(201)
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(40)	23	4	(18)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	7	(13)	(5)	57
Three Win Related Foreign Currency Swaps [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		270	540
Derivative, Fair Value, Net		(82)	(170)
Swap [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		3,877	5,023
Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net		71	59
Equity Contract [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		776	1,407
Equity Contract [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net		(25)	(31)
Equity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	3	30
Interest Rate Swap [Member] | GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		3,140	3,022
Interest Rate Swap [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Fair Value, Net		25	39
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		1,500	2,700
GMWB Hedging Instruments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		7,793	9,452
Derivative, Fair Value, Net		71	67
GMWB Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(45)	36	(134)	(112)
Derivative, Notional Amount		7,793	9,452
Derivative, Fair Value, Net		71	67
Macro Hedge Program [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(36)	153	(260)	(163)
Derivative, Notional Amount		10,765	7,252
Derivative, Fair Value, Net		247	23
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	7	(10)	(5)	57
Fixed Annuity Hedging Instruments [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	10	(15)	4	25
GMWB Product Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	82	(25)	231	88
Derivative, Notional Amount		9,957	11,390
Derivative, Fair Value, Net		(80)	(75)
GMWB Reinsurance [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(25)	1	(49)	(14)
Derivative, Notional Amount		2,115	2,372
Derivative, Fair Value, Net		40	35
Other Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	32	13	(13)	(12)
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1	0	(12)	(9)
Credit Default Swap, Selling Protection [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		393	480
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(3)	(1)	18	15
Other Credit Derivatives [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(10)	35	0	6
Currency Swap [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (3)	$ 2	$ (9)	$ 32