Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 479
Operating lease, rent expense	130
Operating lease, rent expense		$ 94	$ 69
Operating lease, lease not yet commenced, amount	$ 189
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term	1 year
Operating lease, lease not yet commenced, term of contract	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term	11 years
Operating lease, lease not yet commenced, term of contract	10 years
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 498