Acquisitions and Dispositions - Gross Carrying Amount and Weighted-Average Useful Life Allocated to Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 22, 2021	Mar. 31, 2021
Ondot
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 92
Weighted-Average Useful Life (in years)	7 years
Ondot | Acquired software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 60
Weighted-Average Useful Life (in years)	6 years
Ondot | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20
Weighted-Average Useful Life (in years)	10 years
Ondot | Non-compete agreements and other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12
Weighted-Average Useful Life (in years)	3 years
Other Acquisitions
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 81
Weighted-Average Useful Life (in years)		11 years
Other Acquisitions | Acquired software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 14
Weighted-Average Useful Life (in years)		8 years
Other Acquisitions | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 32
Weighted-Average Useful Life (in years)		14 years
Other Acquisitions | Residual buyouts
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 35
Weighted-Average Useful Life (in years)		9 years