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Retirement Plans - Estimated future benefit payments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Defined Benefit Plan Disclosure  
Expected contributions to fund our non-qualified plans and foreign plans $ 55
Pension Benefits  
Estimated future benefit payments  
2017 407
2018 411
2019 417
2020 425
2021 434
2022 - 2026 2,290
Postretirement Benefits Other Than Pensions  
Estimated future benefit payments  
2017 36
2018 34
2019 32
2020 31
2021 29
2022 - 2026 $ 120