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Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Interest Rate Swap Agreements Designated as Cash Flow Hedges

The following table sets forth our interest rate swap agreements, which have been designated as cash flow hedges, at March 31, 2018 (dollars in millions):

 

     Notional
Amount
     Maturity Date      Fair
Value
 

Pay-fixed interest rate swaps

   $ 2,000        December 2021      $ 74  

Pay-fixed interest rate swaps

     500        December 2022        11  
Effect of Interest Rate on Results of Operations

The following table presents the effect of our interest rate swaps on our results of operations for the quarter ended March 31, 2018 (dollars in millions):

 

Derivatives in Cash Flow Hedging Relationships

   Amount of Gain
Recognized in OCI on
Derivatives, Net of  Tax
 

Interest rate swaps

   $ 27