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Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit pension plan formula, highest consecutive years of compensation (in years) 5 years    
Value of the company shares held by the non-U.S. retirement plans at year-end $ 28 $ 23  
Length of time certain gains and losses are considered when determining the market-related value of assets related to the U.S. Qualified pension and retiree health care plans (in years) 3 years    
Expected contribution to retirement benefit plans in next fiscal year $ 20    
Defined benefit plan assets directly invested in TI common stock (in shares) 0    
Liability to participants of the deferred compensation plan $ 298    
Deferred compensation plan assets $ 272    
U.S.      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of company shares held by the U.S. defined contribution plans at year-end (in shares) 8,000,000 9,000,000  
Value of the company shares held by the U.S. defined contribution plans at year-end $ 988 $ 821  
Dividends paid on the company shares held by the U.S. defined contribution plans at year-end 26 24  
Aggregate expense for the U.S. defined contribution plans 61 61 $ 61
U.S. | Defined benefit plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated benefit obligation 878 793  
Non-U.S. | Defined benefit plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated benefit obligation $ 2,460 $ 2,290  
Defined contribution plan, also still accruing defined benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer matching contribution (percent) 2.00%    
Enhanced defined contribution plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer matching contribution (percent) 4.00%    
Defined contribution plan, employer fixed contribution (percent) 2.00%    
Defined contribution plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer fixed contribution (percent) 2.00%