Schedule of Future Minimum Lease Payments Received (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Capital Leases And Operating Leases [Line Items]
Future capital lease payments receivable within one year of the balance sheet date on nonoperating leases	$ 46
Future capital lease payments receivable within the second year from the balance sheet date on nonoperating leases	115
Future capital lease payments receivable within the third year from the balance sheet date on nonoperating leases	39
Future capital lease payments receivable within the fourth year from the balance sheet date on nonoperating leases	57
Future capital lease payments receivable within the fifth year from the balance sheet date on nonoperating leases	44
Future capital lease payments receivable after the fifth year from the balance sheet date on nonoperating leases	802
Future capital lease payments receivable on nonoperating leases	1,103	1,085
Future operating lease payments receivable within one year of the balance sheet date	196
Future operating lease payments receivable within the second year from the balance sheet date	168
Future operating lease payments receivable within the third year from the balance sheet date	76
Future operating lease payments receivable within the fourth year from the balance sheet date	51
Future operating lease payments receivable within the fifth year from the balance sheet date	19
Future operating lease payments receivable after the fifth year from the balance sheet date	20
Future operating lease payments receivable	$ 530

Amount of minimum lease payments to be received by the lessor for capital leases.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

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Amount of minimum lease payments to be received by the lessor for capital leases 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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Amount of minimum lease payments to be received by the lessor for capital leases after 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 minimum lease payments to be received by the lessor for capital leases 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 minimum lease payments to be received by the lessor for capital leases 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 minimum lease payments to be received by the lessor for capital leases 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 minimum lease payments to be received by the lessor for capital leases 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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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the fourth year from the balance sheet date under an operating lease.

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Future rental payments receivable within the third year from the balance sheet date under an operating lease.

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Future rental payments receivable within the second year from the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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