Debt - Long-Term Debt Maturities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014
Debt Instrument [Line Items]
2014	$ 25
2015	588
2016	330
2017	910
2018	780
2019	981
2020	391
2021	912
2022	966
2023	858
Thereafter	1,783
Subtotal	8,524.0
Unamortized premiums (discounts), net	5
Total	8,529
Wholly Owned [Member]
Debt Instrument [Line Items]
2014	23
2015	584
2016	326
2017	909
2018	778
2019	979
2020	389
2021	910
2022	963
2023	857
Thereafter	1,779
Subtotal	8,497.0
Unamortized premiums (discounts), net	5
Total	8,502
Wholly Owned [Member] \| Senior notes [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	0
2017	438
2018	667
2019	694
2020	382
2021	500
2022	956
2023	850
Thereafter	1,639
Subtotal	6,126.0
Unamortized premiums (discounts), net	(7)
Total	6,119
Wholly Owned [Member] \| Exchangeable Notes [Member]
Debt Instrument [Line Items]
2014	0
2015	460
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Subtotal	460.0
Unamortized premiums (discounts), net	(13)
Total	447
Wholly Owned [Member] \| Credit Facilities [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	0
2017	39
2018	0
2019	0
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Subtotal	39.0
Unamortized premiums (discounts), net	0
Total	39
Wholly Owned [Member] \| Other debt [Member]
Debt Instrument [Line Items]
2014	1
2015	1
2016	1
2017	206
2018	1
2019	0
2020	1
2021	404
2022	0
2023	0
Thereafter	10
Subtotal	625.0
Unamortized premiums (discounts), net	0
Total	625
Wholly Owned [Member] \| Secured Mortgage Debt [Member]
Debt Instrument [Line Items]
2014	22
2015	123
2016	325
2017	226
2018	110
2019	285
2020	6
2021	6
2022	7
2023	7
Thereafter	130
Subtotal	1,247.0
Unamortized premiums (discounts), net	25
Total	1,272
Consolidated Entities [Member]
Debt Instrument [Line Items]
2014	2
2015	4
2016	4
2017	1
2018	2
2019	2
2020	2
2021	2
2022	3
2023	1
Thereafter	4
Subtotal	27.0
Unamortized premiums (discounts), net	0
Total	$ 27

Long Term Debt Maturities Repayments Of Principal After Year Nine

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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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Face (par) amount of debt instrument at time of issuance.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

-Section 45

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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-Topic 210

-SubTopic 10

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-Subparagraph (SX 210.5-02.22)

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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Article 9

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-Name Regulation S-X (SX)

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-Paragraph 20, 22

-Article 5

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Publisher FASB

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- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Subparagraph (SX 210.12-04.(a))

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