Investments (Distribution of Held to Maturity Investments by Contractual Maturity) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Amortized Cost	$ 1
Fair Value	1
Variable Interest Entity, Primary Beneficiary [Member] | Fixed-Maturity Investments [Member]
Fair Value	3,703
Variable Interest Entity, Primary Beneficiary [Member] | Fixed-Maturity Investments [Member] | Asset-Backed Securities [Member]
Investments held-to-maturity, at amortized cost (fair value $3,703 and $3,760)	3,934
Fair Value	3,703
Variable Interest Entity, Primary Beneficiary [Member]
Due after one year through five years, Amortized Cost	1	[1]
Due after one year through five years, Fair Value	1	[1]
Investments held-to-maturity, at amortized cost (fair value $3,703 and $3,760)	3,934		4,039
Fair Value	3,703		3,760
Amortized Cost	$ 3,934

[1] - Relates to tax credit investments reported in "Other investments" on the Company's consolidated balance sheet.