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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment, Net.  
Schedule of property, plant and equipment

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December 31,

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December 31,

($ in millions)

    

2019

    

2018

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Land

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$

153

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$

159

Buildings

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​

1,433

​

​

1,359

Machinery and equipment

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​

5,513

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​

5,250

Construction-in-progress

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​

434

​

​

509

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​

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7,533

​

​

7,277

Accumulated depreciation

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​

(3,063)

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(2,735)

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$

4,470

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$

4,542