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Property, Plant and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2020
Property, Plant and Equipment, Net.  
Schedule of property, plant and equipment

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March 31,

​

December 31,

($ in millions)

    

2020

    

2019

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Land

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$

151

​

$

153

Buildings

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​

1,425

​

​

1,433

Machinery and equipment

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5,467

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​

5,513

Construction-in-progress

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​

591

​

​

434

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​

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7,634

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​

7,533

Accumulated depreciation

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​

(3,135)

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​

(3,063)

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$

4,499

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$

4,470