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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2018
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
($ in millions)
Unrealized Foreign Currency Translation Adjustments
 
Pension and Other Postretirement Benefit Adjustments, net of tax
 
Unrealized Gain (Loss) on Derivatives, net of tax
 
Accumulated Other Comprehensive (Loss) Income
January 1, 2018
 
 

($1,567
)
 
 
 

($493
)
 
 
 

$3

 
 
 

($2,057
)
Current year deferrals to AOCI
189

(a) 
 
 
—

 
 
 
—

 
 
 
189

 
 
Current year deferrals to AOCI, net of tax
(45
)
(b) 
 
 
14

 
 
 
(5
)
(d) 
 
 
(36
)
 
 
Reclassification from AOCI to Retained earnings - Adoption ASU 2018 - 02
(23
)
 
 
 
(84
)
 
 
 
—

 
 
 
(107
)
 
 
Reclassifications from AOCI to net income
—

 
 
 
3

(c),(e) 
 
 
3

(d),(e) 
 
 
6

 
 
Net change
 
 

$121

 
 
 

($67
)
 
 
 

($2
)
 
 
 

$52

March 31, 2018
 
 

($1,446
)
 
 
 

($560
)
 
 
 

$1

 
 
 

($2,005
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
January 1, 2017
 
 

($1,798
)
 
 
 

($571
)
 
 
 

$13

 
 
 

($2,356
)
Current year deferrals to AOCI
262

(a) 
 
 
—

 
 
 
—

 
 
 
262

 
 
Current year deferrals to AOCI, net of tax
10

(b) 
 
 
—

 
 
 
(12
)
(d) 
 
 
(2
)
 
 
Reclassifications from AOCI to net income
—

 
 
 
21

(c),(e) 
 
 
(1
)
(d),(e) 
 
 
20

 
 
Net change
 
 

$272

 
 
 

$21

 
 
 

($13
)
 
 
 

$280

March 31, 2017
 
 

($1,526
)
 
 
 

($550
)
 
 
 

$—

 
 
 

($2,076
)

(a) Unrealized foreign currency translation adjustments related to the translation of foreign denominated balance sheet account balances are not presented net of tax given that no deferred U.S. income taxes have been provided on the undistributed earnings of non-U.S. subsidiaries because they are deemed to be reinvested for an indefinite period of time.
(b) The tax cost (benefit) related to unrealized foreign currency translation adjustments on cross currency swaps and debt instruments for the three months ended March 31, 2018 and 2017 was $21 million and ($34) million, respectively.
(c) The tax benefit related to the adjustment for pension and other postretirement benefits for the three months ended March 31, 2018 and 2017 was ($1) million and ($11) million, respectively.
(d) The tax benefit related to the changes in the unrealized gain (loss) on derivatives for the three months ended March 31, 2018 and 2017 was $(1) million and ($6) million, respectively.
(e) Reclassifications from AOCI are included in the computation of net periodic pension and other post-retirement benefit costs (See Note 12, "Pensions and Other Postretirement Benefits") and in the gain recognized on cash flow hedges (See Note 15, "Financial Instruments, Hedging Activities and Fair Value Measurements").