| **Income Taxes (Narrative) (Details) (USD $)In Millions, unless otherwise specified**                                                    | 12 Months Ended      |        |
|------------------------------------------------------------------------------------------------------------------------------------------|----------------------|--------|
||
| **Income Tax Disclosure [Line Items]**                                                                                                   |                 |   |   |
| Repatriation of Certain Wholly-Owned Subsidiaries                                                                                        | $ 700                |   |   |
| Tax Benefits Allocated Directly to Contributed Capital                                                                                   | 12                   | 4      |   |
| Valuation allowance decrease                                                                                                             | 165                  |   |   |
| Gross unrecognized tax benefits                                                                                                          | 232                  | 274    | 297 |
| Cash deposits to offset uncertain tax liabilities                                                                                        |                 |   | 46 |
| Unrecognized tax benefits, income tax penalties and interest expense                                                                     | 7                    |   |   |
| Amount of unrecognized tax benefits that would affect the effective tax rate                                                             | 84                   |   | 106 |
| The total amount of unrecognized tax benefits that, if recognized, would result in adjustments to deferred tax assets with corresponding | 148                  |   | 177 |
| Combined amount of accrued interest and penalties related to uncertain tax positions                                                     | 16                   |   | 23 |
| Amount of unrecognized tax benefits for which it is reasonably possible that there will be a reduction within the next 12 months         | 11                   |   |   |
| Internal Revenue Service (IRS) [Member]                                                                                                  |                 |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |                 |   |   |
| Net operating Loss Carryforwards                                                                                                         | 402                  |   |   |
| Net operating loss attributable to various acquired companies                                                                            | 48                   |   |   |
| Operating loss carryforwards, expiration dates                                                                                           | Jan.				01,				 2032 |   |   |
| Tax credit carry forwards                                                                                                                | 365                  |   |   |
| Tax credit carryforward, expiration dates                                                                                                | Jan.				01,				 2019 |   |   |
| Unrecognized tax benefits, income tax penalties and interest expense                                                                     | 6                    |   |   |
| Previously Unrecognized Tax Benefit                                                                                                      | 73                   |   |   |
| Amount of unrecognized tax benefits that would affect the effective tax rate                                                             | 19                   |   |   |
| Valuation Allowance Decrease As Result of IRS Settlement                                                                                 | 54                   |   |   |
| Foreign Country [Member]                                                                                                                 |                 |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |                 |   |   |
| Undistributed Earnings of Foreign Subsidiaries                                                                                           | 150                  |   |   |
| Tax credit carry forwards                                                                                                                | 14                   |   |   |
| State [Member]                                                                                                                           |                 |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |                 |   |   |
| Net operating Loss Carryforwards                                                                                                         | 932                  |   |   |
| Net operating loss attributable to various acquired companies                                                                            | 137                  |   |   |
| Operating loss carryforwards, expiration dates                                                                                           | Jan.				01,				 2016 |   |   |
| Tax credit carry forwards                                                                                                                | 121                  |   |   |
| Canada Revenue Agency [Member]                                                                                                           |                 |   |   |
| **Income Tax Disclosure [Line Items]**                                                                                                   |                 |   |   |
| Unrecognized tax benefits, income tax penalties and interest expense                                                                     | 3                    |   |   |
| Previously Unrecognized Tax Benefit                                                                                                      | $ 17                 |   |   |

| X                                                                                                                                                                                                                                                                               |
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Cash deposits to offset uncertain tax liabilities
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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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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Valuation Allowance Decrease As Result of IRS Settlement
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| - Definition
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
Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.
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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
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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| - Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.
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| - Definition
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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Amount of expense 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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The amount of the change in the period in the valuation allowance for a specified deferred tax asset.
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