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Debt - Long-Term Debt Maturities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Debt Instrument [Line Items]  
2014 $ 19
2015 475
2016 315
2017 1,977
2018 375
2019 980
2020 384
2021 886
2022 892
2023 859
Thereafter 1,651
Subtotal 8,813
Unamortized premiums (discounts), net 10
Total 8,823
Wholly Owned [Member]
 
Debt Instrument [Line Items]  
2014 17
2015 471
2016 312
2017 1,976
2018 374
2019 978
2020 382
2021 884
2022 889
2023 858
Thereafter 1,646
Subtotal 8,787
Unamortized premiums (discounts), net 10
Total 8,797
Wholly Owned [Member] | Senior Notes [Member]
 
Debt Instrument [Line Items]  
2017 377
2018 262
2019 693
2020 375
2021 500
2022 881
2023 850
Thereafter 1,510
Subtotal 5,448
Unamortized premiums (discounts), net (5)
Total 5,443
Wholly Owned [Member] | Exchangeable Notes [Member]
 
Debt Instrument [Line Items]  
2015 460
Subtotal 460
Unamortized premiums (discounts), net (8)
Total 452
Wholly Owned [Member] | Credit Facilities [Member]
 
Debt Instrument [Line Items]  
2017 742
Subtotal 742
Total 742
Wholly Owned [Member] | Other Debt [Member]
 
Debt Instrument [Line Items]  
2014 1
2015 1
2016 1
2017 630
2018 1
2020 1
2021 373
2022 1
2023 1
Thereafter 8
Subtotal 1,018
Total 1,018
Wholly Owned [Member] | Secured Mortgage Debt [Member]
 
Debt Instrument [Line Items]  
2014 16
2015 10
2016 311
2017 227
2018 111
2019 285
2020 6
2021 11
2022 7
2023 7
Thereafter 128
Subtotal 1,119
Unamortized premiums (discounts), net 23
Total 1,142
Consolidated Entities [Member]
 
Debt Instrument [Line Items]  
2014 2
2015 4
2016 3
2017 1
2018 1
2019 2
2020 2
2021 2
2022 3
2023 1
Thereafter 5
Subtotal 26
Total $ 26