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Commitments and Contingencies - Future Minimum Lease Commitments Under Capital Leases and Noncancellable Operating Leases with Initial or Remaining Terms of One Year or More (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Capital Lease Payments, 2018	$ 15
Capital Lease Payments, 2019	15
Capital Lease Payments, 2020	15
Capital Lease Payments, 2021	15
Capital Lease Payments, 2022	15
Capital Lease Payments, Thereafter	273
Total Capital Lease Payments	$ 348
Operating Lease Payments, 2018		$ 130
Operating Lease Payments, 2019		98
Operating Lease Payments, 2020		82
Operating Lease Payments, 2021		67
Operating Lease Payments, 2022		55
Operating Lease Payments, Thereafter		339
Total Operating Lease Payments		$ 771

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- Definition

Amount of minimum lease payments for capital leases.

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Amount of minimum lease payments for capital leases due 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 for capital leases due 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 for capital leases due 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 for capital leases due 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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