Annual report pursuant to Section 13 and 15(d)

Customer Concentration - Schedule of Revenue from External Customers by Country (Details)

v3.20.4
Customer Concentration - Schedule of Revenue from External Customers by Country (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Concentration Risk [Line Items]                      
Revenues from External Customers $ 1,997 $ 982 $ 1,470 $ 1,718 $ 1,908 $ 1,476 $ 1,705 $ 1,749 $ 6,167 $ 6,838 $ 6,426
Geographic Concentration Risk [Member]                      
Concentration Risk [Line Items]                      
Revenues from External Customers                 5,505 5,526 5,127
Geographic Concentration Risk [Member] | United States                      
Concentration Risk [Line Items]                      
Revenues from External Customers                 2,769 2,354 1,880
Geographic Concentration Risk [Member] | India                      
Concentration Risk [Line Items]                      
Revenues from External Customers                 970 1,113 981
Geographic Concentration Risk [Member] | South Korea                      
Concentration Risk [Line Items]                      
Revenues from External Customers                 924 1,071 1,168
Geographic Concentration Risk [Member] | Ireland                      
Concentration Risk [Line Items]                      
Revenues from External Customers                 $ 842 $ 988 $ 1,098