Business Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Oct. 01, 2015
Assets:
Noncurrent other assets (goodwill, see Note 1 - Goodwill and Other Intangible Assets)	$ 779	$ 778
NET Holdings Management, LLC [Member]
Assets:
Property, plant and equipment			$ 806
Cash			1
Other receivables and current other assets			21
Noncurrent other assets (other intangible assets, see Note 1 - Goodwill and Other Intangible Assets)			720
Noncurrent other assets (goodwill, see Note 1 - Goodwill and Other Intangible Assets)			622
Total assets			2,170
Liabilities:
Long-term debt, including current portion			706
Accounts payable and current other liabilities			46
Noncurrent other liabilities, primarily acquisition holdbacks			415
Total liabilities			1,167
Less noncontrolling interest at fair value			69
Total cash consideration			$ 934