v3.10.0.1
Pension and Postretirement Benefit Plans and Defined Contribution Plans - Expected Future Cash Flow Information (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2019 $ 160
Expected benefit payments:  
2019 166
2020 171
2021 171
2022 168
2023 165
2024-2028 777
United States [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2019 11
Expected benefit payments:  
2019 1,387
2020 1,089
2021 1,058
2022 1,020
2023 1,018
2024-2028 4,837
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2019 167
Expected benefit payments:  
2019 167
2020 121
2021 114
2022 113
2023 103
2024-2028 445
Foreign Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected contributions in 2019 177
Expected benefit payments:  
2019 354
2020 372
2021 380
2022 385
2023 387
2024-2028 $ 2,068