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Investments (Details 34) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Agricultural Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	$ 12,981	$ 12,751
% of Total	100.00%	100.00%
Residential Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	2,657	2,231
% of Total	100.00%	100.00%
Less than 65% [Member]
Agricultural Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	11,639	11,483
% of Total	89.70%	90.10%
65% to 75% [Member]
Agricultural Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	888	885
% of Total	6.80%	6.90%
76% to 80% [Member]
Agricultural Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	12	48
% of Total	0.10%	0.40%
Greater than 80% [Member]
Agricultural Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	442	335
% of Total	3.40%	2.60%
Performing [Member]
Residential Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	2,584	2,149
% of Total	97.30%	96.30%
Nonperforming [Member]
Residential Mortgage Loans - by Credit Quality Indicator:
Recorded investment in Mortgage Loan	$ 73	$ 82
% of Total	2.70%	3.70%

Reflects the gross carrying amount of unpaid loans issued to individuals to acquire or improve land or a building or to provide cash to the borrower, and which are secured by the acquired or improved realty. Loans secured by one to four-family residential property of the borrower are generally referred to as residential mortgage loans. Repayment terms for residential mortgage loans may vary considerably. Such loans may be structured to provide for full amortization of principal, partial amortization with a balloon payment at a specified date, or negative amortization. Interest rates may be fixed or variable. This item excludes subordinated loans such as home equity lines of credit.

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