| **Earnings Per Share - Reconciliation of the number of shares used for Basic and Diluted EPS (Details)In Millions, unless otherwise specified** | 12 Months Ended                                                                |
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| **Earnings Per Share [Abstract]**                                                                                                               |                                                                           |   |   |
| Weighted average common shares outstanding for basic EPS                                                                                        | 437us-gaap_WeightedAverageNumberOfSharesOutstandingBasic                       | 443us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 440us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
| Effect of dilutive securities - stock plans                                                                                                     | 2us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements    | 1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
| Adjusted weighted average common shares outstanding for diluted EPS                                                                             | 439us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding                     | 444us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 441us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
| **Future potentially dilutive shares excluded from diluted EPS:**                                                                               |                                                                           |   |   |
| Options with an exercise price greater than the average market price for the period                                                             | 2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |

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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.
+ References
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| - Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
+ References
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
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