Leases - Schedule of Operating Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lease cost related to lease liabilities	$ 66
Variable lease cost	41
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for lease cost	60
Lease assets obtained in exchange for new lease liabilities	$ 167
Weighted average remaining lease term	8 years 2 months 12 days
Weighted average discount rate	3.37%