Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 443	$ 0
Operating Lease, Liability, Current	93
Operating lease liabilities	355	0
Operating Lease, Liability	$ 448
Operating Lease, Weighted Average Remaining Lease Term	8 years
Operating Lease, Weighted Average Discount Rate, Percent	3.50%
Lease, Cost [Abstract]
Operating Lease, Cost	$ 113
Short-term Lease, Cost	58
Lease, Cost	171
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	106
Lessee, Operating Lease, Liability, Payments, Due Year Two	83
Lessee, Operating Lease, Liability, Payments, Due Year Three	69
Lessee, Operating Lease, Liability, Payments, Due Year Four	55
Lessee, Operating Lease, Liability, Payments, Due Year Five	43
Lessee, Operating Lease, Liability, Payments, Due after Year Five	189
Lessee, Operating Lease, Liability, Payments, Due	545
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(97)
Operating Leases, Future Minimum Payments Due, Next Twelve Months		94
Operating Leases, Future Minimum Payments, Due in Two Years		89
Operating Leases, Future Minimum Payments, Due in Three Years		70
Operating Leases, Future Minimum Payments, Due in Four Years		56
Operating Leases, Future Minimum Payments, Due in Five Years		42
Operating Leases, Future Minimum Payments, Due Thereafter		152
Operating Leases, Future Minimum Payments Due		$ 503
Affiliates [Member]
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	50
Fixed Lease Payments [Member] | Affiliates [Member]
Lease, Cost [Abstract]
Operating Lease, Cost	$ 18