Acquisitions and Divestitures - Supplemental Pro Forma Financial Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Amortization of intangible assets	$ 56	$ 60	$ 178	$ 176
Interest expense, net of capitalized interest	$ 62	$ 56	173	167
Share-based compensation expense			$ 46	$ 51

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of noncash expense for share-based payment arrangement.

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