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Fair Value Measurements and Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 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 and six months ended June 30, 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 June 30, 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
)
 
—

 
(1
)
 
—

 
—

Non-designated cash flow hedges
 
—

 
—

 
—

 
—

 
1

 
2

Foreign currency risk - Interest expense, net:
 
 
 
 
 
 
 
 
 
 
 
 
Net investment hedges
 
8

 
(12
)
 
—

 
—

 
—

 
—

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

 
—

 
—

 
(1
)
 
—

 
—

 
 
$
9

 
$
(14
)
 
$
—

 
$
(2
)
 
$
—

 
$
2

Six Months Ended June 30, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Foreign currency risk - Sales:
 
 
 
 
 
 
 
 
 
 
 
 
Cash flow hedges
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-designated cash flow hedges
 
—

 
—

 
—

 
—

 
—

 
—

Foreign currency risk - Cost of sales:
 
 
 
 
 
 
 
 
 
 
 
 
Cash flow hedges
 
2

 
—

 
—

 
(3
)
 
—

 
—

Non-designated cash flow hedges
 
—

 
—

 
—

 
—

 
1

 
3

Foreign currency risk - Interest expense, net:
 
 
 
 
 
 
 
 
 
 
 
 
Net investment hedges
 
2

 
(13
)
 
—

 
—

 
—

 
—

Interest rate risk - Interest expense, net:
 
 
 
 
 
 
 
 
 
 
 
 
Interest rate swap
 
2

 
—

 
—

 
(1
)
 
—

 
—

 
 
$
6

 
$
(13
)
 
$
—

 
$
(4
)
 
$
1

 
$
3