Related Party (Affiliated Asset Transfers) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Asset Transfers With PFI [Member]
Related Party Transactions [Line Items]
Fixed maturity asset transfer amortized cost	$ 123
Fixed maturity asset transfer fair value	141
Asset Transfer APIC Change	11
Asset Transfers With Other Affiliates [Member]
Related Party Transactions [Line Items]
Fixed maturity asset transfer amortized cost	27	143
Fixed maturity asset transfer fair value	28	151
Realized gain on fixed maturity asset transfer	1	8
Commercial mortgage loans asset transfer amortized cost	27	49
Commercial mortgage loans asset transfer fair value	28	54
Realized gain on commerical mortgage loan asset transfer	$ 1	$ 5