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Segments - Summary of Segment Profit (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues $ 4,559 $ 4,529 $ 4,701 $ 5,065 $ 5,398 $ 5,617 $ 5,720 $ 5,650 $ 18,854 $ 22,385 $ 21,903
Gross profit $ 1,971 $ 1,977 $ 2,033 $ 2,315 $ 2,444 $ 2,599 $ 2,802 $ 2,770 8,296 10,615 11,653
R&D expenses                 1,213 1,778 2,077
S&M expenses                 2,916 3,395 3,583
G&A expenses                 1,298 1,451 1,390
Operating (loss) income                 (1,637) (17,484) 2,154
North America [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 9,297 12,141 11,778
Gross profit                 4,979 7,322 8,404
R&D expenses                 713 969 1,040
S&M expenses                 1,154 1,288 1,362
G&A expenses                 484 533 496
Other income (loss)                 (209) (92) (30)
Operating (loss) income                 2,837 4,624 5,536
Europe [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 5,186 5,466 4,969
Gross profit                 2,884 2,887 2,685
R&D expenses                 283 390 383
S&M expenses                 1,003 1,130 1,267
G&A expenses                 325 354 377
Other income (loss)                 0 (16) (9)
Operating (loss) income                 1,273 1,029 667
International Markets [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Revenues                 3,005 3,395 4,015
Gross profit                 1,254 1,433 1,811
R&D expenses                 96 154 205
S&M expenses                 518 672 754
G&A expenses                 153 189 226
Other income (loss)                 (11) (8) (10)
Operating (loss) income                 $ 498 $ 426 $ 636