| **Income Taxes (Narrative) (Details) - USD ($) $ in Millions**                                                                           | 12 Months Ended |        |
|------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------|
||
| **Income Tax Disclosure [Line Items]**                                                                                                   |            |   |   |   |
| Other Tax Benefit                                                                                                                        | $ 41            |   |   |   |
| Deferred Tax Assets, Valuation Allowance                                                                                                 | 100.00%         |   |   |   |
| Stock Repurchased and Retired During Period, Value                                                                                       | $ 1,018         | $ 337  |   |   |
| Tax Benefits Allocated Directly to Contributed Capital                                                                                   | 83              | 21     | $ 12 |   |
| Valuation allowance decrease                                                                                                             |            | 441    |   |   |
| Gross unrecognized tax benefits                                                                                                          | 331             | 254    | $ 232 | $ 297 |
| Amount of unrecognized tax benefits that would affect the effective tax rate                                                             | 305             |   |   |   |
| The total amount of unrecognized tax benefits that, if recognized, would result in adjustments to deferred tax assets with corresponding | 26              |   |   |   |
| Combined amount of accrued interest and penalties related to uncertain tax positions                                                     | 15              | 16     |   |   |
| Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Increase Decrease                                                    | 1               |   |   |   |
| Amount of unrecognized tax benefits for which it is reasonably possible that there will be a reduction within the next 12 months         | 50              |   |   |   |
| Unremitted earnings of foreign subsidiaries                                                                                              | 43              | 0      |   |   |
| Deferred Tax Assets, Valuation Allowance                                                                                                 | 114             | 555    |   |   |
| Internal Revenue Service (IRS) [Member]                                                                                                  |            |   |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |            |   |   |   |
| Tax credit carry forwards                                                                                                                | $ 373           |   |   |   |
| Tax credit carryforward, expiration dates                                                                                                | Jan.  01,  2024 |   |   |   |
| Foreign Country [Member]                                                                                                                 |            |   |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |            |   |   |   |
| Undistributed Earnings of Foreign Subsidiaries                                                                                           | $ 1,241         |   |   |   |
| Tax credit carry forwards                                                                                                                | 8               |   |   |   |
| State [Member]                                                                                                                           |            |   |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |            |   |   |   |
| Net operating Loss Carryforwards                                                                                                         | 1,016           |   |   |   |
| Net operating loss attributable to various acquired companies                                                                            | 130             |   |   |   |
| Tax credit carry forwards                                                                                                                | 93              |   |   |   |
| Fiscal Year 2016 Repurchase Program [Member]                                                                                             |            |   |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |            |   |   |   |
| Stock Repurchased and Retired During Period, Value                                                                                       | $ 500           | $ 0    |   |   |

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Operating Loss Carry Forwards Attributable To Acquisition
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| - Definition
The total amount of unrecognized tax benefits that, if recognized, would result in adjustments to deferred tax assets with corresponding adjustments to the valuation allowance
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Unrecognized tax benefits income tax penalties and interest accrued increase decrease
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| - Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.
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The sum of the tax effects of all items occurring during the period that have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
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| - Definition
Amount of other income tax expense (benefit).
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| - Definition
The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.
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| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
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| - Definition
The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.
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Expiration date of the tax credit carryforward, in CCYY-MM-DD format.
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| - Definition
Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.
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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.
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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.
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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.
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