Segment and Geographic Area Information - Geographic Information Table (Details) - 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
Schedule Of Geographical Information [Line Items]
Revenues from external customers	$ 4,143	$ 4,319	$ 4,504	$ 4,484	$ 4,278	$ 2,371	$ 2,533	$ 2,581	$ 17,450	$ 11,763	$ 9,274
Long-lived assets	4,687				4,268				4,687	4,268
United States
Schedule Of Geographical Information [Line Items]
Revenues from external customers									6,203	4,488	3,632
Long-lived assets	1,363				1,234				1,363	1,234
China
Schedule Of Geographical Information [Line Items]
Revenues from external customers									2,377	1,553	1,283
Long-lived assets	768				687				768	687
Germany
Schedule Of Geographical Information [Line Items]
Revenues from external customers									2,227	1,212	798
Long-lived assets	539				543				539	543
Poland
Schedule Of Geographical Information [Line Items]
Revenues from external customers									925	731	488
Long-lived assets	331				319				331	319
United Kingdom
Schedule Of Geographical Information [Line Items]
Revenues from external customers									568	499	482
Long-lived assets	130				116				130	116
Mexico
Schedule Of Geographical Information [Line Items]
Revenues from external customers									959	543	416
Long-lived assets	277				239				277	239
India
Schedule Of Geographical Information [Line Items]
Revenues from external customers									475	316	216
Long-lived assets	182				167				182	167
Turkey
Schedule Of Geographical Information [Line Items]
Revenues from external customers									5	7	9
Long-lived assets	250				276				250	276
Other Foreign
Schedule Of Geographical Information [Line Items]
Revenues from external customers									3,711	2,414	$ 1,950
Long-lived assets	$ 847				$ 687				$ 847	$ 687