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Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
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| Schedule Of Goodwill And Other Intangible Assets [Line Items] | |||
| Customer loyalty payments in cash | $ 60 | $ 38 | |
| Balance of accrued commissions and incentives | 266 | 211 | |
| Other current assets reclassified as customer loyalty payments within other intangible assets | 50 | ||
| Other non-current assets reclassified as customer loyalty payments within other intangible assets | 68 | ||
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Customer Relationships [Member]
|
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| Schedule Of Goodwill And Other Intangible Assets [Line Items] | |||
| Amortization expense | 61 | 61 | |
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Customer Loyalty Payments [Member]
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| Schedule Of Goodwill And Other Intangible Assets [Line Items] | |||
| Balance of accrued commissions and incentives | 22 | 15 | |
| Amortization expense | $ 45 | $ 48 | |