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Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
1 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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May 31, 2014
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Acquired Intangible Assets [Member]
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Jun. 30, 2013
Acquired Intangible Assets [Member]
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Jun. 30, 2014
Acquired Intangible Assets [Member]
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Jun. 30, 2013
Acquired Intangible Assets [Member]
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Jun. 30, 2014
Customer Loyalty Payments [Member]
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Jun. 30, 2013
Customer Loyalty Payments [Member]
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Jun. 30, 2014
Customer Loyalty Payments [Member]
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Jun. 30, 2013
Customer Loyalty Payments [Member]
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Dec. 31, 2013
Customer Loyalty Payments [Member]
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| Schedule Of Goodwill And Other Intangible Assets [Line Items] | |||||||||||||
| Goodwill acquired | $ 14 | $ 14 | |||||||||||
| Acquisition of goodwill paid in cash | 10 | ||||||||||||
| Deferred consideration to be paid | 4 | ||||||||||||
| Customer loyalty payments in cash | 45 | 36 | |||||||||||
| Balances of accrued commission and incentives | 298 | 253 | 62 | 62 | 35 | ||||||||
| Amortization expense | $ 20 | $ 20 | $ 39 | $ 40 | $ 19 | $ 15 | $ 37 | $ 29 | |||||