| **Restructuring and Impairments - Narrative (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended |
|--------------------------------------------------------------------------------------------------------|----------------|----------------|----------------|----------------|----------------|
||
| **Restructuring Cost and Reserve [Line Items]**                                                        |           |           |           |           |           |   |   |   |   |   |   |   |   |   |   |   |   |
| Restructuring charges                                                                                  | $ 6            | $ 19           | $ 8            | $ 19           | $ 4            | $ 21 | $ 3 | $ 16 | $ 19 |   |   | $ 73 | $ 7 | $ 66 |   |   |   |
| Restructuring and Related Cost, Expected Cost                                                          |           |           |           |           |           |   |   |   |   |   |   |   |   |   | 10 | 20 | 70 |
| Impairment of Intangible Assets (Excluding Goodwill)                                                   |           |           | $ 8            | $ 38           |           |   |   |   |   | $ 28 | $ 10 |   |   |   |   |   |   |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16373-109275Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 46 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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| - Definition
Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.
+ References
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| - Definition
Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.
+ References
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