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Pensions and Other Benefit Plans - Projected Future Benefit Payments from Company's Retirement and Other Benefit Plans (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Retirement plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 970
2019 1,007
2020 1,057
2021 1,131
2022 1,190
2023-2027 7,062
Other benefit plans  
Defined Benefit Plan Disclosure [Line Items]  
2018 322
2019 312
2020 306
2021 301
2022 297
2023-2027 $ 1,395