Other Assets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Other assets
Long-term deferred tax assets	$ 198		$ 237
Long-term pension assets	579		559
Investments in affiliates	285		302
Right-of-use operating lease assets	236	$ 244
Company and trust-owned life insurance	167		152
Other	152		159
Other Assets	$ 1,617		$ 1,409