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Segments - Summary of Segment Profit (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 4,468 $ 4,093 $ 4,177 $ 4,149 $ 4,419 $ 4,385 $ 4,552 $ 4,916 $ 16,887 $ 18,271 $ 21,853
Gross profit $ 1,958 $ 1,830 $ 1,893 $ 1,856 $ 1,971 $ 1,977 $ 2,033 $ 2,315 7,537 8,296 10,615
R&D expenses                 1,010 1,213 1,778
S&M expenses                 2,614 2,916 3,395
G&A expenses                 1,192 1,298 1,451
Segment profit                 (443) (1,637) (17,484)
North America [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 8,542 9,297 12,141
Gross profit                 4,350 4,979 7,322
R&D expenses                 652 713 969
S&M expenses                 1,021 1,154 1,288
G&A expenses                 439 484 533
Other (income) expense                 (14) (209) (92)
Segment profit                 2,252 2,837 4,624
Europe [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 4,795 5,186 5,466
Gross profit                 2,704 2,884 2,887
R&D expenses                 262 283 390
S&M expenses                 890 1,003 1,130
G&A expenses                 239 325 354
Other (income) expense                 (5)   (16)
Segment profit                 1,318 1,273 1,029
International Markets [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues [1]                 2,246 2,422 2,863
Gross profit [1]                 1,167 1,254 1,433
R&D expenses [1]                 88 96 154
S&M expenses [1]                 481 518 672
G&A expenses [1]                 138 153 189
Other (income) expense [1]                 (3) (11) (8)
Segment profit [1]                 $ 464 $ 498 $ 426
[1] The data presented for prior periods have been revised to reflect a revision in the presentation of net revenues and cost of sales in the consolidated financial statements. See note 1b.