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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017
 
 
$
(1,798
)
 
 
 
$
(571
)
 
 
 
$
13

 
 
 
$
(2,356
)
Current year deferrals to AOCI
634

(a) 
 
 
—

 
 
 
—

 
 
 
634

 
 
Current year deferrals to AOCI, net of tax
(262
)
(b) 
 
 
(93
)
(c) 
 
 
(13
)
(d) 
 
 
(368
)
 
 
Reclassifications from AOCI to net income
—

 
 
 
30

(c),(e) 
 
 
(3
)
(d),(e) 
 
 
27

 
 
Net change
 
 
$
372

 
 
 
$
(63
)
 
 
 
$
(16
)
 
 
 
$
293

September 30, 2017
 
 
$
(1,426
)
 
 
 
$
(634
)
 
 
 
$
(3
)
 
 
 
$
(2,063
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
January 1, 2016
 
 
$
(1,332
)
 
 
 
$
(1,379
)
 
 
 
$
9

 
 
 
$
(2,702
)
Current year deferrals to AOCI
(157
)
(a) 
 
 
—

 
 
 
—

 
 
 
(157
)
 
 
Current year deferrals to AOCI, net of tax
(73
)
(b) 
 
 
(267
)
(c) 
 
 
(6
)
(d) 
 
 
(346
)
 
 
Reclassifications from AOCI to net income
—

 
 
 
658

(c),(e) 
 
 
6

(d),(e) 
 
 
664

 
 
Net change
 
 
$
(230
)
 
 
 
$
391

 
 
 
$
—

 
 
 
$
161

September 30, 2016
 
 
$
(1,562
)
 
 
 
$
(988
)
 
 
 
$
9

 
 
 
$
(2,541
)

(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 benefit related to unrealized foreign currency translation adjustments on tax inter-branch transactions and net investment hedges for the nine months ended September 30, 2017 and 2016 was $(157) million and ($53) million, respectively. The balance also includes a remeasurement of the tax cost on certain foreign proceeds which have not been permanently reinvested.
(c) The tax benefit related to the adjustment for pension and other postretirement benefits for the nine months ended September 30, 2017 and 2016 was $(27) million and $(252) million, respectively.
(d) The tax benefit related to the changes in the unrealized gain (loss) on derivatives for the nine months ended September 30, 2017 and 2016 was $(7) million and $(1) million, respectively.