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Cash Dividends - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
May 14, 2014
Statement Of Partners Capital [Abstract]          
Dividends Payable, Amount Per Share         $ 0.46
Aggregated Cash Dividends Paid $ 198 $ 111 $ 309 $ 167