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Other (Income) Expense, Net - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Component of Other Income / Expense of Nonoperating [Line Items]      
Goodwill impairment charges $ 162 $ 144  
Write-down of assets held for sale   41  
Loss on extinguishment of debt     $ 191
Interest paid 841 777 723
Healthcare Services      
Component of Other Income / Expense of Nonoperating [Line Items]      
Goodwill impairment charges $ 162 144  
CGRP receptor antagonists      
Component of Other Income / Expense of Nonoperating [Line Items]      
Gain (loss) on sale of clinical development programs   85  
AstraZeneca LP      
Component of Other Income / Expense of Nonoperating [Line Items]      
Other income   99 $ 232
Patent litigation      
Component of Other Income / Expense of Nonoperating [Line Items]      
Litigation settlement, gain (loss)   $ 115