Long-term Debt and Other Financing Arrangements - Summary of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total long-term debt, Weighted average interest rate	4.04%	3.79%
Total long-term debt, Carrying Amount	$ 7,196	$ 6,694
Capital lease and other financing obligations, Carrying Amount	142	118
Total debt and other financing arrangements	7,338	6,812
Less: Current portion of long-term debt, capital lease and other financing obligations and other short-term borrowings	310	393
Long-term debt and capital lease obligations	7,028	6,419
Total long-term debt, Fair Value	$ 7,222	$ 6,727
Senior secured credit facilities
Debt Instrument [Line Items]
Total long-term debt, Weighted average interest rate	2.78%	2.65%
Total long-term debt, Carrying Amount	$ 3,496	$ 3,742
Total long-term debt, Fair Value	$ 3,497	$ 3,731
Debenture loans
Debt Instrument [Line Items]
Total long-term debt, Weighted average interest rate	5.22%	5.23%
Total long-term debt, Carrying Amount	$ 3,693	$ 2,944
Total long-term debt, Fair Value	3,718	2,988
Senior Secured Term Loan Facility Due 2019 | Libor Based Variable Rate
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	1,455	1,532
Total long-term debt, Fair Value	1,454	1,533
Senior Secured Term Loan Facility Due 2019 | Euro LIBOR or LIBOR Based Variable Rate
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	164	280
Total long-term debt, Fair Value	163	274
Senior Secured Term Loan Due 2017 | Libor Based Variable Rate
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	492	497
Total long-term debt, Fair Value	492	493
Senior Secured Term Loan Facility Due 2021 | Libor Based Variable Rate
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	1,080	1,090
Total long-term debt, Fair Value	1,082	1,088
Senior Secured Term Loan Facility Due 2021 | Euro Libor Based Variable Rate
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	305	343
Total long-term debt, Fair Value	306	343
Senior Debenture Loan Due 2020
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	792	791
Total long-term debt, Fair Value	808	801
Senior Debenture Loan Due 2022
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	2,284	1,537
Total long-term debt, Fair Value	2,270	1,554
Senior debenture loan due 2021
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	617	616
Total long-term debt, Fair Value	640	633
Other Loans
Debt Instrument [Line Items]
Total long-term debt, Carrying Amount	7	8
Total long-term debt, Fair Value	$ 7	$ 8