Other Assets (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Other assets
Long-term deferred tax assets	$ 266	$ 325
Long-term pension assets	508	504
Investments in affiliates	274	274
Company and trust-owned life insurance	174	160
Other	144	143
Other Assets	$ 1,366	$ 1,406