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Fair Value Measurements and Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]
Gains and losses on derivative financial instruments for the three months ended March 31, 2018 and 2017 are as follows:
 
 
Recorded Income (Loss) into AOCI, net of tax
 
Reclassified from AOCI into Income (Loss)
 
Recorded in Income (Loss)
 
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
 
(Dollars in Millions)
Three Months Ended March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Foreign currency risk - Sales:

 
 
 
 
 
 
 
 
 
 
 
 
Cash flow hedges

 
$
1

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-designated cash flow hedges
 
—

 
—

 
—

 
—

 
1

 
—

Foreign currency risk - Cost of sales:
 
 
 
 
 
 
 
 
 
 
 
 
Cash flow hedges
 
1

 
2

 
—

 
(2
)
 
—

 
—

Non-designated cash flow hedges
 
—

 
—

 
—

 
—

 
—

 
1

Interest rate risk - Interest expense, net:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swap
 
1

 
—

 
—

 
—

 
—

 
—

Net investment hedges
 
(6
)
 
(1
)
 
—

 
—

 
—

 
—

 
 
$
(3
)
 
$
1

 
$
—

 
$
(2
)
 
$
1

 
$
1