Derivatives and Hedging Activities (Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Derivatives and Hedging Activities
Asset	$ 4,101		$ 3,418
Liability	4,688		4,370
GMWB and GMAB [Member] | GMWB and GMAB embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Asset	221		742
Liability	700		167
Derivatives designated as hedging instruments [Member] | Fixed rate debt [Member] | Fair value hedges [Member]
Derivatives and Hedging Activities
Asset	76		82
Derivatives designated as hedging instruments [Member] | Fixed rate debt [Member] | Other assets [Member] | Fair value hedges [Member]
Derivatives and Hedging Activities
Asset	76		82
Derivatives not designated as hedging instruments [Member]
Derivatives and Hedging Activities
Asset	4,025		3,336
Liability	4,688		4,370
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member]
Derivatives and Hedging Activities
Asset	3,938		3,230
Liability	4,267		4,015
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Interest rate derivative contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	1,955		1,484
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Interest rate derivative contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	1,136		1,672
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Equity contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	1,954		1,741
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	2,650		2,918
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Credit contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset			3
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Foreign exchange contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	29		2
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	2
Derivatives not designated as hedging instruments [Member] | GMWB and GMAB [Member] | GMWB and GMAB embedded derivatives [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	479	[1],[2]	(575)	[1],[2]
Derivatives not designated as hedging instruments [Member] | EIA embedded derivatives [Member] | Equity contracts [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	6		5
Derivatives not designated as hedging instruments [Member] | IUL [Member] | Equity contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	39		27
Derivatives not designated as hedging instruments [Member] | IUL [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	12		13
Derivatives not designated as hedging instruments [Member] | IUL embedded derivatives [Member] | Equity contracts [Member] | Policyholder account balances, future policy benefits and claims [Member]
Derivatives and Hedging Activities
Liability	242		125
Derivatives not designated as hedging instruments [Member] | Stock market certificates [Member] | Equity contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	46		73
Derivatives not designated as hedging instruments [Member] | Stock market certificates [Member] | Equity contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	40		66
Derivatives not designated as hedging instruments [Member] | Stock market certificates embedded derivatives [Member] | Equity contracts [Member] | Customer deposits [Member]
Derivatives and Hedging Activities
Liability	6		7
Derivatives not designated as hedging instruments [Member] | Foreign currency [Member] | Foreign exchange contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	1		2
Derivatives not designated as hedging instruments [Member] | Seed money [Member] | Foreign exchange contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	1
Derivatives not designated as hedging instruments [Member] | Macro hedge program [Member] | Other contracts [Member] | Other assets [Member]
Derivatives and Hedging Activities
Asset	1		4
Derivatives not designated as hedging instruments [Member] | Macro hedge program [Member] | Other contracts [Member] | Other liabilities [Member]
Derivatives and Hedging Activities
Liability	114		139
Derivatives not designated as hedging instruments [Member] | Total other derivatives [Member]
Derivatives and Hedging Activities
Asset	87		106
Liability	$ 421		$ 355

[1] The fair values of GMWB and GMAB embedded derivatives fluctuate based on changes in equity, interest rate and credit markets.

[2] The fair value of the GMWB and GMAB embedded derivatives at December 31, 2014 included $700 million of individual contracts in a liability position and $221 million of individual contracts in an asset position. The fair value of the GMWB and GMAB embedded derivatives was a net asset at December 31, 2013 reported as a contra liability, including $742 million of individual contracts in an asset position and $167 million of individual contracts in a liability position.