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Summary of Significant Accounting Policies - Schedule of Supplemental Cash Flow Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information [Line Items]
Interest, net of capitalized interest and periodic settlements from interest rate swap agreements	$ 485	$ 470	$ 477
Income taxes	$ 366	$ 306	$ 547

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.