Derivatives and Hedging Activities (Balance Sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2017	Dec. 31, 2016
Derivatives and Hedging Activities
Notional amount		$ 131,433	$ 142,316
Asset	[1]	3,563	3,446
Liability	[2],[3]	3,895	4,262
Derivative liability after application of master netting arrangements and cash collateral including embedded derivative liabilities		1,300	1,500
Fair value of investment securities received as collateral		89	235
Fair value of investment securities received as collateral that can be repledged		89	118
Fair value of investment securities received as collateral that were repledged		0	19
GMWB and GMAB embedded derivatives [Member]
Derivatives and Hedging Activities
Asset		492	266
Liability		443	880
GMWB and GMAB embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	[2],[3],[4]	(49)	614
IUL embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	601	464
Indexed annuity embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	5	5
SMC embedded derivatives [Member] | Customer deposits [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	10	8
Embedded derivatives [Member]
Derivatives and Hedging Activities
Asset	[1]	0	0
Liability	[2],[3]	567	1,091
Derivatives designated as hedging instruments [Member]
Derivatives and Hedging Activities
Notional amount		762	839
Derivatives designated as hedging instruments [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]	23	52
Derivatives designated as hedging instruments [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[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
Asset	[1]	23	40
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivatives and Hedging Activities
Notional amount		87	164
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]		12
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	4
Derivatives not designated as hedging instruments [Member]
Derivatives and Hedging Activities
Notional amount		130,671	141,477
Derivatives not designated as hedging instruments [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]	3,540	3,394
Derivatives not designated as hedging instruments [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	3,324	3,171
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives and Hedging Activities
Notional amount		66,043	72,449
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]	1,081	1,738
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	416	989
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member]
Derivatives and Hedging Activities
Notional amount		59,292	63,015
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]	2,423	1,574
Derivatives not designated as hedging instruments [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	2,883	2,135
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member]
Derivatives and Hedging Activities
Notional amount		721	1,039
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]		1
Derivatives not designated as hedging instruments [Member] | Credit contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	2
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member]
Derivatives and Hedging Activities
Notional amount		4,163	4,733
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	[1]	36	81
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	[2],[3]	23	47
Derivatives not designated as hedging instruments [Member] | Other contracts [Member]
Derivatives and Hedging Activities
Notional amount		$ 452	$ 241

[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 $1.3 billion and $1.5 billion as of December 31, 2017 and 2016, respectively. See Note 15 for additional information related to master netting arrangements and cash collateral. See Note 4 for information about derivatives held by consolidated VIEs.

[4] 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. The fair value of the GMWB and GMAB embedded derivatives as of December 31, 2016 included $880 million of individual contracts in a liability position and $266 million of individual contracts in an asset position.