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Employee Retirement Plans (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cap on Contribution Toward Future Retiree Medical Coverage | 120.00% |  |
Percentage of Cost to Be Paid by Employees for Retiree Medical Upon Retirement | 100.00% |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 3,800 | $ 3,900 |
Credit Risk of Plan Assets, Long Duration Corporate Bonds | 59.00% |  |
Currency Fluctuations, Assets Invested in Non US Investments | 12.00% |  |
Liquidity Risk, Long Term Investments in Private Equity and Real Estate | 8.00% |  |
Defined Contribution Plan, Cost Recognized | $ 67 | 60 | $ 53
Bond Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of Bonds | item | 350 |  |
Percent to Yield | 10.00% |  |
Minimum [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 20.00% |  |
Minimum [Member] | Private Equity and Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |  |
Minimum [Member] | Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of Bonds | item | 375 |  |
Percent to Yield | 40.00% |  |
Maximum [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 25.00% |  |
Maximum [Member] | Private Equity and Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 15.00% |  |
Maximum [Member] | Commodities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |  |
United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 105 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 75 |  |
International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | 12 |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 31 |  |
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | 7 |  |
Pension Benefits [Member] | United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | 0 |
Pension Benefits [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | $ 29 |
Postretirement Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) | 7 |  |
Defined Benefit Plan, Future Amortization of Gain (Loss) | $ 1 |  |

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- Definition Represents the percentage of plan assets which are invested in long duration bonds. + References No definition available. + Details
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- Definition Percent of assets which are invested in non-U.S. dollar denominated investments. + References No definition available. + Details
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- Definition Represents the percentage of the cost to be paid by employees for retiree medical benefits upon retirement. This is applicable to employees hired or rehired on or after January 1, 2007. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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