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Netting Arrangements (Policies)
12 Months Ended
Dec. 31, 2017
Offsetting [Abstract]  
Derivatives, Offsetting Policy [Policy Text Block]
We offset the carrying amounts of certain derivatives that are in gain positions and loss positions with the same counterparty as well as cash collateral receivables and payables associated with derivative positions under master netting arrangements. We offset these amounts only when we have the legal right to offset under the contract and we have met all of the offsetting conditions.
We determine our rights to offset the assets and liabilities presented above with the same counterparty, including collateral posted or received, based on the contractual arrangements entered into with our individual counterparties and various rules and regulations that would govern the insolvency of a derivative counterparty.
Derivative instruments are recorded at fair value and securities purchased under agreements to resell or similar arrangements are recorded at amortized cost in our consolidated balance sheets.