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Benefit Plans - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) arrangement | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) arrangement | Jun. 30, 2017 USD ($) | Apr. 01, 2018 arrangement
U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement losses and other expenses | $ 3 | $ 11 | $ 3 | $ 11 |
U.S. Plans | Multiemployer Plans, Pension | Fund | BCTGM |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, number of expired collective-bargaining arrangements | arrangement | 8 |  | 8 |  | 8
Multiemployer plan, number of collective-bargaining arrangements | arrangement | 7 |  | 7 |  |
U.S. Plans | Multiemployer Plans, Pension | Fund | BCTGM | North America |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Multiemployer plan, partial withdrawal liability | $ 567 |  | $ 567 |  |
Multiemployer plan, withdrawal obligation | 408 |  | 408 |  |
Multiemployer plan, withdrawal obligation, net of tax | $ 305 |  |  |  |
Multiemployer plan, withdrawal obligation term | 20 years |  |  |  |
Pension Plans | U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement losses and other expenses | $ 8 | 18 | 15 | 21 |
Employer contribution |  |  | 5 |  |
Estimated future employer contributions | 34 |  | 34 |  |
Pension Plans | Non-U.S. Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement losses and other expenses | 0 | $ 1 | 0 | $ 2 |
Employer contribution |  |  | 199 |  |
Estimated future employer contributions | $ 102 |  | 102 |  |
Pension Plans | Non-U.S. Plans | United Kingdom and Ireland |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contribution |  |  | $ 137 |  |

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