Fair Value Measurements (Details 3-Reported) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Estimate of Fair Value Measurement [Member]
Financial assets
Current assets	$ 4	$ 3
Other noncurrent assets	26	76
Total financial assets	30	79
Financial liabilities
Other current liabilities	62	37
Long-term debt, including current portion(a)	6,174	5,469
Deferred credits and other liabilities	99	93
Total financial liabilities	6,335	5,599
Reported Value Measurement [Member]
Financial assets
Current assets	4	3
Other noncurrent assets	38	81
Total financial assets	42	84
Financial liabilities
Other current liabilities	90	58
Long-term debt, including current portion(a)	5,529	5,528
Deferred credits and other liabilities	86	88
Total financial liabilities	$ 5,705	$ 5,674