Leases - Schedule of Lease Expense and Other Details Related to Operating Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating leases
Operating lease costs	$ 75
Variable lease costs	20
Supplemental Operating Cash Flows Information
Cash paid for amounts included in the measurement of lease liabilities	80
ROU assets obtained in exchange for new lease obligations	$ 65
Weighted Average Lease terms and discount rates
Remaining lease term	5 years
Discount rate	4.02%