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Other Income/(Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net periodic pension and OPEB income/(cost), excluding service cost $ 378 $ 365 $ 1,284 $ 1,144
Investment-related interest income 169 124 482 325
Unrecognized Tax Benefits Interest Income (5) (2) 28 (1)
Gain/(Loss) on Investment (76) (13) 136 14
Gains/(Losses) on changes in investments in affiliates (14) (21) 44 (23)
Royalty Income, Nonoperating 115 171 387 475
Other 38 130 111 286
Total $ 605 $ 754 $ 2,472 $ 2,220