Long-term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2014
|
Dec. 31, 2013
|
---|---|---|
Proforma Debt Instrument [Line Items] | ||
Long-term debt, fair value | $ 11,300 | $ 10,400 |
Commercial Paper
|
||
Proforma Debt Instrument [Line Items] | ||
Committed debt facility agreement aggregated | 1,100 | |
Commercial Paper | Long-term debt – current portion
|
||
Proforma Debt Instrument [Line Items] | ||
Committed debt facility agreement aggregated | $ 300 | $ 95 |