Summary of Significant Accounting Policies - Schedule of Supplemental Cash Flow Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
Accounting Policies [Abstract] | |||
Interest, net of capitalized interest and periodic settlements from interest rate swap agreements | $ 478 | $ 485 | $ 470 |
Income taxes | $ 511 | $ 366 | $ 306 |