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Cash Dividends - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Aug. 13, 2014
Statement of Partners' Capital [Abstract]          
Dividends Payable, Amount Per Share         $ 0.46
Aggregated Cash Dividends Paid $ 198 $ 111 $ 507 $ 278