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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined benefit plan, additional pension expense | $ 5 | $ 5 | $ 5
Defined benefit plan, pension settlement charges | 14 |  |
Amounts of common stock included in plan assets | 189 | 177 |
Defined benefit plan, estimated employer contributions | $ 18 |  |
Employee Savings Investment Plan, minimum age requirement | 21 years |  |
Maximum contribution percent by employer | 50.00% |  |
Employer matching contribution, percent of employee's gross pay | 3.00% |  |
Total contributions | $ 2 | $ 2 | $ 2
Percentage of employee stock purchase plan, employee contribution | 85.00% |  |
Percentage of employee stock purchase plan, employer contribution | 15.00% |  |
Shares purchased under employee stock purchase plan (in shares) | 25,511 | 26,299 |
Employee stock purchase plan, company contribution (less than) | $ 1 | $ 1 |
Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Estimated net losses of pensions in following twelve months | 93 |  |
Estimated prior service credits of pensions in following twelve months | (10) |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Estimated net losses of pensions in following twelve months | 4 |  |
Estimated prior service credits of pensions in following twelve months | $ (37) |  |
Non-U.S. Plans | Pension Plan | United Kingdom |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Funding level | 100.00% |  |
Target funding level period | 9 years |  |
Expected return net of fees | 2.00% |  |
Percentage change of risk level commensurate | 5.00% |  |
Weighted average return of equity securities period (years) | 25 years |  |
Non-U.S. Plans | Pension Plan | United Kingdom | Minimum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Yearly rate of funding level decline | 4.00% |  |
Non-U.S. Plans | Pension Plan | United Kingdom | Maximum |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Yearly rate of funding level decline | 7.00% |  |
Non-U.S. Plans | Pension Plan | United Kingdom | Debt securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 2.50% |  |
Non-U.S. Plans | Pension Plan | United Kingdom | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 5.00% |  |
Non-U.S. Plans | Pension Plan | United Kingdom | Equity securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 8.50% |  |
U.S. Plans | Pension Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Weighted average return of equity securities period (years) | 25 years |  |
U.S. Plans | Pension Plan | Equity securities and alternative investments [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 9.20% |  |
U.S. Plans | Pension Plan | Debt securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 4.20% |  |
U.S. Plans | Pension Plan | Real estate |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 5.00% |  |

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