Debt - Long-Term Debt Maturities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Maturities Of Long Term Debt [Line Items]
2013	$ 1,477
2014	3,022
2015	1,447
2016	1,086
2017	1,249
2018	1,284
2019	1,151
2020	689
2021	158
2022	10
Thereafter	152
Subtotal	11,725
Unamortized (discounts) premiums, net	66.0	22.6
Total	11,791
Consolidated Entities [Member]
Maturities Of Long Term Debt [Line Items]
2013	207
2014	65
2015	25
2016	127
2017	4
2018	74
2019	2
2020	2
2021	2
2022	3
Thereafter	5
Subtotal	516
Unamortized (discounts) premiums, net	3.0
Total	519
Wholly Owned [Member]
Maturities Of Long Term Debt [Line Items]
2013	1,270
2014	2,957
2015	1,422
2016	959
2017	1,245
2018	1,210
2019	1,149
2020	687
2021	156
2022	7
Thereafter	147
Subtotal	11,209
Unamortized (discounts) premiums, net	63.0
Total	11,272
Wholly Owned [Member] \| Senior Notes [Member]
Maturities Of Long Term Debt [Line Items]
2013	376
2014	916
2015	287
2016	640
2017	700
2018	900
2019	647
2020	677
Subtotal	5,143
Unamortized (discounts) premiums, net	80.0
Total	5,223
Wholly Owned [Member] \| Exchangeable Notes [Member]
Maturities Of Long Term Debt [Line Items]
2013	484
2015	460
Subtotal	944
Unamortized (discounts) premiums, net	(67.0)
Total	877
Wholly Owned [Member] \| Credit Facilities [Member]
Maturities Of Long Term Debt [Line Items]
2014	420
2015	469
Subtotal	889
Total	889
Wholly Owned [Member] \| Other Debt [Member]
Maturities Of Long Term Debt [Line Items]
2014	640
2015	1
2016	1
2017	1
2018	1
2019	1
2020	1
2021	1
Thereafter	10
Subtotal	657
Total	657
Wholly Owned [Member] \| Secured Mortgage Debt [Member]
Maturities Of Long Term Debt [Line Items]
2013	410
2014	981
2015	205
2016	318
2017	544
2018	309
2019	501
2020	9
2021	155
2022	7
Thereafter	137
Subtotal	3,576
Unamortized (discounts) premiums, net	50.0
Total	$ 3,626

Long-term debt maturities repayments of principal in year eight.

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Long-term debt maturities repayments of principal in year nine

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Long-term debt maturities repayments of principal in year seven.

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Long-term debt maturities repayments of Principal in year six.

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Long-term debt maturities repayments of principal in year ten.

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Total principal of long-term debt outstanding, excludes any discounts or premiums.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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-Paragraph 16, 20

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

+ References

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-Publisher FASB

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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