v3.8.0.1

Employee Benefit Plans (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) year | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage of annual salary Contributed by the Company for employees (401(k) plans) | 4.00% |  |  |
General And Administrative Expense |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Contribution Plan, Cost | $ 74 | $ 72 | $ 64 |
Other liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net accumulated liability for non-retiree postemployment benefits provided to former or inactive employee | 0 | 20 |  |
Rabbi Trust |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 1,283 | 1,227 |  |
Fair value of plan assets | 881 | 829 |  |
Rabbi Trust | Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 81 |  |  |
Fair value of plan assets | 120 | 115 |  |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 13,838 | 12,917 | 12,221 |
Fair value of plan assets | $ 13,655 | $ 12,861 | $ 12,541 |
Defined Benefit Plan Weighted Average Asset Allocations | 100.00% | 100.00% |  |
Bond Yield rate used in determining Discount rate | 3.65% | 4.15% | 4.50% | 4.10%
Expected long-term rate of return on plan assets | 6.25% | 6.25% | 6.25% | 6.25%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year | $ 200 |  |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | 1,996 | $ 2,084 | $ 2,159 |
Fair value of plan assets | $ 1,615 | $ 1,531 | $ 1,584 |
Defined Benefit Plan Weighted Average Asset Allocations | 100.00% | 100.00% |  |
Bond Yield rate used in determining Discount rate | 3.60% | 4.05% | 4.35% | 3.95%
Expected long-term rate of return on plan assets | 7.00% | 7.00% | 7.00% | 7.00%
Defined Benefit Plans Estimated Future Employer Contributions in Next Fiscal Year | $ 10 |  |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Bond Yield rate used in determining Discount rate | 90.00% |  |  |
Maximum | Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Age | year | 55 |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 20 years |  |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Bond Yield rate used in determining Discount rate | 10.00% |  |  |
Minimum | Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Age | year | 50 |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 10 years |  |  |
Annuity Contracts | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Obligation | $ 21 | $ 19 |  |
Private Equity Funds and Real Estate Funds | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fund expected term | 15 years |  |  |
Liquidation extension period (up to) | 2 years |  |  |
Private Equity Funds and Real Estate Funds | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fund expected term | 7 years |  |  |
Hedge Fund | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lock-up restriction period | 2 years |  |  |
Period for written notice | 185 days |  |  |
Percent of fund's net assets | 25.00% |  |  |
Hedge Fund | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lock-up restriction period | 1 year |  |  |
Period for written notice | 65 days |  |  |
Percent of fund's net assets | 20.00% |  |  |
Foreign plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan Weighted Average Asset Allocations | 5.00% | 5.00% |  |
Foreign plans | Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension benefits for foreign plans percentage of the ending benefit obligation | 14.00% | 14.00% |  |

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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