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Segments - Summary of Segment Profit (Detail) - 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
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 4,454 $ 3,978 $ 3,870 $ 4,357 $ 4,468 $ 4,093 $ 4,177 $ 4,149 $ 16,659 $ 16,887 $ 18,271
Gross profit $ 2,048 $ 1,852 $ 1,763 $ 2,063 $ 1,958 $ 1,830 $ 1,893 $ 1,856 7,726 7,537 8,296
R&D expenses                 997 1,010 1,213
S&M expenses                 2,498 2,614 2,916
G&A expenses                 1,173 1,192 1,298
Segment profit                 (3,572) (443) (1,637)
North America [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 8,447 8,542 9,297
Gross profit                 4,489 4,350 4,979
R&D expenses                 622 652 713
S&M expenses                 1,013 1,021 1,154
G&A expenses                 443 439 484
Other (income) expense                 (10) (14) (209)
Segment profit                 2,421 2,252 2,837
Europe [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 4,757 4,795 5,186
Gross profit                 2,666 2,704 2,884
R&D expenses                 247 262 283
S&M expenses                 830 890 1,003
G&A expenses                 261 239 325
Other (income) expense                 (3) (5)  
Segment profit                 1,331 1,318 1,273
International Markets [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 2,154 2,246 2,422
Gross profit                 1,096 1,167 1,254
R&D expenses                 70 88 96
S&M expenses                 427 481 518
G&A expenses                 136 138 153
Other (income) expense                 (11) (3) (11)
Segment profit                 $ 474 $ 464 $ 498