Fair Value Measurements (Details 9) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets not carried at fair value [Abstract]
Policy loans	$ 1,416	$ 1,951
Mortgage loans, carrying value	3,585	4,935
Level 3 [Member]
Assets not carried at fair value [Abstract]
Policy loans	1,416	1,951
Mortgage loans, carrying value		4,935
Liabilities not carried at fair value [Abstract]
Other policyholder funds and benefits payable	9,199	9,318
Consumer notes	130	159
Policy Loans [Member] | Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans Receivable, Fair Value Disclosure	1,481	2,112
Mortgage Loans [Member] | Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Loans Receivable, Fair Value Disclosure	3,702	5,109
Other policyholder funds and benefits payable [Member] | Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Notes Payable, Fair Value Disclosure	9,521	9,668
Consumer Notes [Member] | Level 3 [Member]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Notes Payable, Fair Value Disclosure	$ 131	$ 159