Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating leases	$ 92
Short-term leases	10
Lease expense	102
Less: sublease income	0
Net lease cost	102
Cash payments to settle a lease liability reported in cash flows	104
Right-of-use assets obtained in exchange for new lease liabilities	$ 60
Weighted average discount rate (percent)	3.02%
Weighted average remaining lease term (in years)	5 years 1 month 6 days