Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Other assets
Long-term deferred tax assets	$ 316	$ 325
Long-term pension assets	532	504
Investments in affiliates	281	274
Company and trust-owned life insurance	168	160
Other	145	143
Other Assets	$ 1,442	$ 1,406