Investments and Derivative Instruments (Details Textual 3) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Additional Investments and Derivative Instruments (Textual) [Abstract]
Gross gains and losses on sales and impairments previously reported as unrealized losses in AOCI	$ 11,000,000	$ 102,000,000	$ 88,000,000	$ 18,000,000
Proceeds from sales of AFS securities	5,600,000,000	5,700,000,000	14,200,000,000	9,900,000,000
Number of securities included in AFS securities in an unrealized loss position, primarily related to municipal securities	1,718		1,718
Percentage of gross unrealized losses depressed	78.00%		78.00%
Securities Depressed to Cost or Amortized Cost Lower Limit	20.00%		20.00%
Minimum maturity of securities included in continuous loss position			10 years
Carrying value of mortgage loans associated with the valuation allowance	332,000,000		332,000,000		347,000,000
Valuation allowances on mortgage loans held for sale	3,000,000		3,000,000		4,000,000
Mortgage loans held for sale, carrying value	48,000,000		48,000,000		57,000,000
Current weighted average loan to value ratio of commercial mortgage loan	65.00%		65.00%
Original weighted average loan to value ratio of commercial mortgage loan	63.00%		63.00%
Avg. Debt-Service Coverage Ratio	2.09		2.09
Collateral received as percentage of fair value of securities loaned			95.00%
Percent of fair value of securities transferred for collateral obtained on repurchase agreement			at least 95%
Securities transferred fair value	1,600,000,000		1,600,000,000
Securities sold under agreements to repurchase	(1,600,000,000)		(1,600,000,000)
Notional amount of interest rate swaps in offsetting relationships	5,100,000,000		5,100,000,000		5,100,000,000
Deferred net gains on derivative instruments before tax to be reclassified to earnings during next twelve months			84,000,000
Increase in notional amount of hedging instruments			13,200,000,000
Maximum amount of net reclassifications from AOCI to earnings			$ 7,000,000	$ 0

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Available-for-sale Securities, Maturity of Securities Included in Continuous Loss Position, Minimum

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Available-for-sale securities mortgage loans average debt service coverage ratio.

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Carrying value of mortgage loans associated with the valuation allowance.

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Cash Collateral for Loaned Securities, Collateral Received as Percentage of Securities Loaned, Minimum

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Certain loans acquired in transfer held-for-sale accounted for as debt securities carrying amount net.

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Certain loans and debt securities acquired in transfer held for sale allowance for credit losses due to subsequent impairment.

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Current weighted average loan to value ratio of commercial mortgage loan.

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Gross gains and losses on sales and impairments reported in AOCI.

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Increase in notional amount of hedging instruments.

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Maximum gain loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring net.

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Number of securities included in AFS securities in unrealized loss position.

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Original weighted average loan to value ratio of commercial mortgage loan.

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Percentage of gross unrealized losses depressed less than twenty percent of cost or amortized cost.

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Percent of fair value of securities transferred for collateral obtained on repurchase agreement

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Securities depressed to cost or amortized cost lower limit.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in fair value hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days.

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The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos.

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