Derivatives and Hedging Activities (Balance Sheet) (Details) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Derivatives and Hedging Activities
Notional amount		$ 128,213	$ 131,433
Gross fair value of assets	[1]	3,169	3,563
Gross fair value of liabilities	[2],[3]	3,577	3,895
Derivative liability after application of master netting arrangements and cash collateral including embedded derivative liabilities		883	1,300
Fair value of investment securities received as collateral		15	89
Fair value of investment securities received as collateral that can be repledged		15	89
Fair value of investment securities received as collateral that were repledged		0
GMWB and GMAB embedded derivatives [Member]
Derivatives and Hedging Activities
Gross fair value of assets		638	492
Gross fair value of liabilities		309	443
GMWB and GMAB embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3],[4]	(329)	(49)
IUL embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	585	601
Indexed annuities | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	7	5
SMC embedded derivatives [Member] | Customer deposits [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	9	10
Total embedded derivatives [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	272	567
Derivatives designated as hedging instruments [Member]
Derivatives and Hedging Activities
Notional amount		884	762
Derivatives designated as hedging instruments [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	15	23
Derivatives designated as hedging instruments [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	3	4
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives and Hedging Activities
Notional amount		675	675
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	15	23
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivatives and Hedging Activities
Notional amount		209	87
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	3	4
Derivatives not designated as hedging instruments [Member]
Derivatives and Hedging Activities
Notional amount		127,329	130,671
Derivatives not designated as hedging instruments [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	3,154	3,540
Derivatives not designated as hedging instruments [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	3,302	3,324
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives and Hedging Activities
Notional amount		63,848	66,043
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	804	1,081
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	512	416
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Derivatives and Hedging Activities
Notional amount		58,260	59,292
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	2,316	2,423
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	2,766	2,883
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member]
Derivatives and Hedging Activities
Notional amount		856	721
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	0
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	2	2
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivatives and Hedging Activities
Notional amount		4,363	4,163
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	34	36
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	22	23
Derivatives not designated as hedging instruments [Member] | Other contracts [Member]
Derivatives and Hedging Activities
Notional amount		2	$ 452
Derivatives not designated as hedging instruments [Member] | Other contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Gross fair value of assets	[1]	0
Derivatives not designated as hedging instruments [Member] | Other contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Gross fair value of liabilities	[2],[3]	$ 0

[1] The fair value of freestanding derivative assets is included in Other assets on the Consolidated Balance Sheets.

[2] The fair value of freestanding derivative liabilities is included in Other liabilities on the Consolidated Balance Sheets. The fair value of GMWB and GMAB, IUL, and indexed annuity embedded derivatives is included in Policyholder account balances, future policy benefits and claims on the Consolidated Balance Sheets. The fair value of the SMC embedded derivative liability is included in Customer deposits on the Consolidated Balance Sheets.

[3] The fair value of the Company’s derivative liabilities after considering the effects of master netting arrangements, cash collateral held by the same counterparty and the fair value of net embedded derivatives was $883 million and $1.3 billion as of March 31, 2018 and December 31, 2017, respectively. See Note 12 for additional information related to master netting arrangements and cash collateral.

[4] The fair value of the GMWB and GMAB embedded derivatives as of March 31, 2018 included $309 million of individual contracts in a liability position and $638 million of individual contracts in an asset position. The fair value of the GMWB and GMAB embedded derivatives as of December 31, 2017 included $443 million of individual contracts in a liability position and $492 million of individual contracts in an asset position.