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Employee Benefit Plans (Pension Plans) (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  | $ (116,000,000) | $ 542,000,000 | $ 326,000,000
Payment for Pension Benefits |  | 2,112,000,000 | 303,000,000 | 147,000,000
Domestic Defined Benefit Plan Stock Contributions By Employer |  | 0 | 0 | 250,000,000
Defined Benefit Plan, Accumulated Benefit Obligation | $ 34,200,000,000 | 36,200,000,000 | 34,200,000,000 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension Benefits |  | 212,000,000 | 203,000,000 |
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension Benefits |  | 1,900,000,000 | 100,000,000 |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  | $ 609,000,000 | (676,000,000) |
Pension Payout Program, Voluntary Lump-Sum Value |  |  | 170,000,000 |
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits |  | 74.00% |  |
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits |  | 25.00% |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  | $ (179,000,000) | 401,000,000 | 649,000,000
Range Of Growth Seeking Assets In Company's Overall Investment Strategy |  | 50% to 55% |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy |  | 45% to 50% |  |
Pecentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge |  | 55% to 60% |  |
Defined Benefit Plan Common Stock Funded Percentage |  | 1.00% |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year |  | $ 100,000,000 |  |
Expected return on plan assets |  | 2,215,000,000 | 2,202,000,000 | 2,264,000,000
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months |  | 2,044,000,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two |  | 1,903,000,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three |  | 1,952,000,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four |  | 2,004,000,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five |  | 2,054,000,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter |  | 10,710,000,000 |  |
Pension Plan [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Expected return on plan assets |  | $ 0.07 |  |
Pension de-risking actions [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  |  | 1,500,000,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ (423,000,000) |  |  |
Purchase of Annuity Contract [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  |  | 768,000,000 |
Lump Sum Payments [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change |  |  | $ 935,000,000 |
Change in Assumptions for Defined Benefit Plans [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Change in Accounting Estimate, Description |  |  | At the end of fiscal 2015, we changed the approach we use to estimate the service and interest components of net periodic pension cost for our significant pension plans. This change compared to the previous approach resulted in a net decrease in the service and interest components of our annual net periodic pension cost of approximately $215 million for 2016. Historically, we estimated the service and interest cost components utilizing a single-weighted average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. We have elected to utilize a full yield curve approach in the estimation of these components by applying the specific spot rates along the yield curve used in determination of the benefit obligation to the relevant projected cash flows. We have made this change to provide a more precise measurement of service and interest costs by improving the correlation between projected benefit cash flows to the corresponding spot yield curve rates. This change does not materially affect the measurement of our total benefit obligations. |
Impact of change in estimation of NPPC |  |  | $ (215,000,000) |
Discontinued Operations [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment |  |  |  | (109,000,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) |  |  |  | $ 98,000,000

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