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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended | 93 Months Ended
--- | --- | --- | --- | ---
Sep. 15, 2018 | Dec. 31, 2017 | Jun. 30, 2011 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Company match percentage |  |  |  | 7.00% |  |  |
Contributions |  |  |  | $ 81 | $ 82 | $ 77 |
Employer contribution | $ 358 |  |  |  |  |  |
Discretionary contributions by employer | $ 350 |  |  |  |  |  |
Other Postretirement Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Decrease in postretirement obligations |  |  | $ 138 | (4) | (16) |  |
Postretirement benefit expense |  |  |  | (22) | (23) | (10) | $ 83
Transfer of liabilities |  |  |  | 0 | 0 |  |
Employer contribution |  |  |  | $ 36 | 40 |  |
United States Pension Benefits | Postretirement Health Coverage |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Service requirement |  |  |  | 10 years |  |  |
Plan, age requirement |  |  |  | 55 years |  |  |
United States Pension Benefits | Pension Benefits |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Decrease in postretirement obligations |  |  |  | $ 0 | 0 |  |
Postretirement benefit expense |  |  |  | 0 | (8) | $ (11) |
Transfer of liabilities |  | $ 64 |  | 0 | (64) |  |
Employer contribution |  |  |  | $ 380 | $ 47 |  |
United States Pension Benefits | Pension Benefits | Equity Securities |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 35.00% |  |  | 35.00%
United States Pension Benefits | Pension Benefits | Fixed Income Funds |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 65.00% |  |  | 65.00%
United States Pension Benefits | Pension Benefits | US Large-Cap Companies |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 50.00% |  |  | 50.00%
United States Pension Benefits | Pension Benefits | Equity securities, international companies |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 25.00% |  |  | 25.00%
United States Pension Benefits | Pension Benefits | US mid and Small Cap Companies |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 13.00% |  |  | 13.00%
United States Pension Benefits | Pension Benefits | Venture Capital Funds |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 12.00% |  |  | 12.00%
United States Pension Benefits | Pension Benefits | Corporate Debt Securities |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 75.00% |  |  | 75.00%
United States Pension Benefits | Pension Benefits | US Treasury and Government |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Target plan asset allocations |  |  |  | 25.00% |  |  | 25.00%

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