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Other Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Other assets    
Long-term deferred tax assets $ 202 $ 325
Long-term pension assets 508 504
Investments in affiliates 314 274
Company and trust-owned life insurance 176 160
Other 158 143
Other Assets $ 1,358 $ 1,406