Derivative Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Derivative Instruments
Maximum length of time hedged in cash flow hedge (in years)			14
Notional of credit derivative	$ 315		$ 315		$ 369
Fair value of credit derivative liability			1.1		1.6
Maximum exposure to loss from externally-managed investments	0		0		7
Pruco Re and Prudential Insurance FV of embedded derivatives related to reinsurance recoverables	1,761		1,761		1,748
FV Of Embedded Derivatives Included In Future Policy Benefits	1,796		1,796		1,784
FV Of Embedded Derivatives Included In Fixed Maturities AFS	0		0		3
Credit protection purchased notional amounts	30		30		30
Credit derivative protection purchased fair value	2		2		2
Mark-to-market on embedded derivatives	575	144	12	(69)
Fees ceded on embedded derivatives	66	69	133	125
Change in reinsurance recoverable	556	139	14	(68)
Fees attributed to embedded derivative	$ 58	$ 56	$ 117	$ 111