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Retirement Plans (Retirement Plans, Funded Status) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expense for the defined contribution plans for continuing operations |  | $ 173 | $ 111 | $ 288
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Benefit obligation at end of period |  | 1,200 | 1,100 |
Fair value of plan assets at end of period |  | 940 | 865 |
Funded status at end of period |  | 280 | 241 |
Amounts recognized on the Consolidated Balance Sheets |  |  |  |
Accrued employee compensation and benefits |  | 15 | 16 |
Employee compensation and benefits |  | 267 | 227 |
Pension plans in which projected benefit obligation exceeded plan assets |  |  |  |
Projected benefit obligation |  | 1,202 | 1,083 |
Fair value of plan assets |  | 920 | 840 |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |  |  |
Accumulated benefit obligation |  | 1,139 | 1,037 |
Fair value of plan assets |  | 920 | 840 |
Foreign Pension Plans, Defined Benefit |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 940 | 865 |
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 11 | 49 |
Foreign Pension Plans, Defined Benefit | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[2] | 204 | 197 |
Foreign Pension Plans, Defined Benefit | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[3] | 369 | 276 |
Foreign Pension Plans, Defined Benefit | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[4] | 184 | 221 |
Foreign Pension Plans, Defined Benefit | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[5] | 126 | 71 |
Foreign Pension Plans, Defined Benefit | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 46 | 51 |
Foreign Pension Plans, Defined Benefit | Level 1 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 7 | 5 |
Foreign Pension Plans, Defined Benefit | Level 1 | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 1 | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[2] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 1 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[3] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 1 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[4] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 1 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[5] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 1 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 7 | 5 |
Foreign Pension Plans, Defined Benefit | Level 2 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 842 | 755 |
Foreign Pension Plans, Defined Benefit | Level 2 | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 11 | 49 |
Foreign Pension Plans, Defined Benefit | Level 2 | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[2] | 204 | 197 |
Foreign Pension Plans, Defined Benefit | Level 2 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[3] | 323 | 232 |
Foreign Pension Plans, Defined Benefit | Level 2 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[4] | 184 | 221 |
Foreign Pension Plans, Defined Benefit | Level 2 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[5] | 98 | 36 |
Foreign Pension Plans, Defined Benefit | Level 2 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 22 | 20 |
Foreign Pension Plans, Defined Benefit | Level 3 |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 91 | 105 |
Foreign Pension Plans, Defined Benefit | Level 3 | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 3 | Equity funds (b) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[2] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 3 | Bond funds (c) |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[3] | 46 | 44 |
Foreign Pension Plans, Defined Benefit | Level 3 | alternatives fund [Domain] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[4] | 0 | 0 |
Foreign Pension Plans, Defined Benefit | Level 3 | Real Estate Funds [Member] |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period | [1],[5] | 28 | 35 |
Foreign Pension Plans, Defined Benefit | Level 3 | Other assets |  |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Fair value of plan assets at end of period |  | $ 17 | $ 26 |
United Kingdom Pension Plan |  |  |  |
Pension plans in which accumulated benefit obligation exceeded plan assets |  |  |  |
United Kingdom pension plan percentage of international pension plans' projected benefit obligations |  | 84.00% |  |
[1] | Common/collective trust funds are valued at the net asset value of units held by the plans at year-end.
[2] | Strategy is to invest in diversified funds of global common stocks.
[3] | Strategy is to invest in diversified funds of fixed income securities of varying geographies and credit quality and whose cash flows approximate the maturities of the benefit obligation.
[4] | Strategy is to invest in a fund of diversifying investments, including but not limited to reinsurance, commodities and currencies.
[5] | Strategy is to invest in diversified funds of real estate investment trusts and private real estate.

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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