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Earnings per share - Additional Information (Details)
10 Months Ended 12 Months Ended
Dec. 31, 2016
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
May 10, 2016
EquityInstruments
Earnings per share [line items]          
Alcatel Lucent American Depositary Shares       8,746,000  
Alcatel Lucent          
Earnings per share [line items]          
Number of shares acquired 107,775,949     107,775,949  
Depositary in settlement of the transaction | EquityInstruments         59,276,772
Alcatel Lucent American Depositary Shares 9,000,000        
Restricted Shares          
Earnings per share [line items]          
Antidilutive share equivalents excluded (in shares)   4,000,000 5,000,000 5,000,000  
Performance Shares          
Earnings per share [line items]          
Antidilutive share equivalents excluded (in shares)   21,000,000 14,000,000 10,000,000  
Maximum | Stock Option          
Earnings per share [line items]          
Antidilutive share equivalents excluded (in shares)   1,000,000 1,000,000 1,000,000