Combined Summarized Balance Sheet Information (Detail) (Other Investments, USD $) In Millions	Dec. 31, 2010	Dec. 31, 2009
Other Investments
Segment Reporting, Asset Reconciling Item [Line Items]
Property and equipment, net	$ 1,354	$ 1,461
Other assets	132	175
Total assets	1,486	1,636
Debt	945	1,037
Other liabilities	142	212
Equity	399	387
Total liabilities and equity	$ 1,486	$ 1,636

This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include current and noncurrent assets, the total of which components are represented herein.

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This item represents the disclosure of summarized financial information for unconsolidated subsidiaries and 50 percent-or-less owned entities accounted for using the equity method of accounting. If investments in common stock of corporate joint ventures or other investments accounted for under the equity method are, in the aggregate, material in relation to the financial position or results of operations of an investor, it may be necessary to present summarized information as to assets of the investee, or group of investments for which combined disclosure is appropriate, either by individual financial statement caption or in groups, as appropriate. Such summarized financial information may, at a minimum, include current and noncurrent liabilities, redeemable preferred stock, and noncontrolling interest and, if included, equity or capital (as applicable), the total of which components are represented herein.

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