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Notes Receivable - Composition of our Notes Receivable Balances (Net of Reserves and Unamortized Discounts) (Detail) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2015
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Dec. 31, 2014
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|---|---|---|
| Receivables [Abstract] | ||
| Senior, mezzanine, and other loans | $ 245 | $ 242 |
| Less current portion | (91) | (27) |
| Notes receivable, noncurrent | $ 154 | $ 215 |