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Pension and Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | 177 | 171 |
Defined benefit plan, estimated employer contributions | $ 60 |  |
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) | 26,299 | 25,917 |
Employee stock purchase plan, company contribution (less than) | $ 1 | $ 1 |
Non-U.S. Plans [Member] | United Kingdom [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Funding level | 100.00% |  |
Target funding level period | 11 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 [Member] | United Kingdom [Member] | Minimum [Member] |  |  |
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 [Member] | United Kingdom [Member] | Maximum [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Yearly rate of funding level decline | 8.00% |  |
Non-U.S. Plans [Member] | United Kingdom [Member] | Debt securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 3.70% |  |
Non-U.S. Plans [Member] | United Kingdom [Member] | Real estate [Member] |  |  |
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 [Member] | United Kingdom [Member] | Equity securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 9.00% |  |
Pension Plan [Member] |  |  |
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 | $ (11) |  |
U.S. Plans [Member] |  |  |
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 [Member] | 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 | 9.80% |  |
U.S. Plans [Member] | Debt securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 4.40% |  |
U.S. Plans [Member] | Real estate [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Assumed rate of return on assets, percentage | 5.00% |  |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Estimated net losses of pensions in following twelve months | $ 5 |  |
Estimated prior service credits of pensions in following twelve months | (41) |  |
Prescription drug expected future benefit payments | $ 4 |  |

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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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