Leases Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Gross		$ 18,354	$ 18,187
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		(6,851)	(6,832)
Property, Plant and Equipment, Net		11,963	$ 12,442
Operating Lease, Right-of-Use Asset	[1]	$ 171
Operating Lease, Weighted Average Remaining Lease Term		17 years 6 months
Finance Lease, Weighted Average Remaining Lease Term		6 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent		5.10%
Finance Lease, Weighted Average Discount Rate, Percent		8.00%
Property Subject to Finance Lease [Member]
Property, Plant and Equipment, Gross	[2]	$ 212
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	[2]	(105)
Property, Plant and Equipment, Net	[2]	$ 107

[1] The right-of-use assets associated with our operating leases as of December 31, 2019 are included in other assets on our Consolidated Balance Sheet.

[2] The right-of-use assets associated with our finance leases as of December 31, 2019 are included in property, plant and equipment, net on our Consolidated Balance Sheet.