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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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Goodwill and Intangible Assets - Definite-Lived Intangible Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Definite-lived intangible assets
Amortization of intangible assets	$ 1,553,000,000	$ 1,294,000,000	$ 1,076,000,000
Definite-lived intangible assets impairment charges	0	$ 0	$ 354,000,000
Anticipated annual amortization expense
2020	1,800,000,000
2021	2,000,000,000.0
2022	2,300,000,000
2023	2,400,000,000
2024	$ 2,500,000,000
Minimum
Definite-lived intangible assets
Amortization period	2 years
Maximum
Definite-lived intangible assets
Amortization period	16 years
Weighted Average \| Developed product rights
Definite-lived intangible assets
Amortization period	11 years
Weighted Average \| License agreements
Definite-lived intangible assets
Amortization period	11 years