Borrowings and Lines of Credit (Detail)	3 Months Ended	12 Months Ended								12 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended					12 Months Ended		12 Months Ended				12 Months Ended				12 Months Ended							12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2013 Notes 5.75 Percent Due 2013	Dec. 31, 2014 Notes 3.875 Percent Due 2015 USD ($)	Dec. 31, 2013 Notes 3.875 Percent Due 2015 USD ($)	Dec. 31, 2014 Notes 1.9 Percent Due 2016 USD ($)	Dec. 31, 2013 Notes 1.9 Percent Due 2016 USD ($)	Dec. 31, 2014 Notes 7.375 Percent Due 2016 USD ($)	Dec. 31, 2013 Notes 7.375 Percent Due 2016 USD ($)	Dec. 31, 2014 Notes 6.875 Percent Due 2017 USD ($)	Dec. 31, 2013 Notes 6.875 Percent Due 2017 USD ($)	Dec. 31, 2014 3-year Variable Rate Euro Bank Loan Due 2017 EUR (€)	Dec. 31, 2014 3-year Variable Rate Euro Bank Loan Due 2017 USD ($)	Nov. 30, 2014 3-year Variable Rate Euro Bank Loan Due 2017 EUR (€)	Dec. 31, 2013 3-year Variable Rate Euro Bank Loan Due 2017 USD ($)	Dec. 31, 2014 Notes 6.65 Percent Due 2018 USD ($)	Dec. 31, 2013 Notes 6.65 Percent Due 2018 USD ($)	Dec. 31, 2014 Notes 7.4 Percent Due 2019 USD ($)	Dec. 31, 2013 Notes 7.4 Percent Due 2019 USD ($)	Dec. 31, 2014 Notes 2.3 Percent Due 2019 [Member] USD ($)	Nov. 30, 2014 Notes 2.3 Percent Due 2019 [Member] USD ($)	Dec. 31, 2013 Notes 2.3 Percent Due 2019 [Member] USD ($)	Dec. 31, 2014 Notes 3.6 Percent Due 2020 USD ($)	Dec. 31, 2013 Notes 3.6 Percent Due 2020 USD ($)	Dec. 31, 2014 Non-callable Debentures 9 Percent Due 2021 USD ($)	Dec. 31, 2013 Non-callable Debentures 9 Percent Due 2021 USD ($)	Dec. 31, 2014 Note 2.5 Percent Due 2029 [Member] EUR (€)	Dec. 31, 2014 Note 2.5 Percent Due 2029 [Member] USD ($)	Nov. 30, 2014 Note 2.5 Percent Due 2029 [Member] EUR (€)	Dec. 31, 2013 Note 2.5 Percent Due 2029 [Member] USD ($)	Dec. 31, 2014 Notes 7.70 Percent Due 2038 USD ($)	Dec. 31, 2013 Notes 7.70 Percent Due 2038 USD ($)	Dec. 31, 2014 Notes 5.5 Percent Due 2040 USD ($)	Dec. 31, 2013 Notes 5.5 Percent Due 2040 USD ($)	Dec. 31, 2014 Note 3.0 Percent Due 2044 [Member] USD ($)	Nov. 30, 2014 Note 3.0 Percent Due 2044 [Member] EUR (€)	Dec. 31, 2013 Note 3.0 Percent Due 2044 [Member] USD ($)	Dec. 31, 2014 Impact Of Derivatives On Debt USD ($)	Dec. 31, 2013 Impact Of Derivatives On Debt USD ($)	Dec. 31, 2014 Other Non US Debt, Weighted Average USD ($)	Dec. 31, 2013 Other Non US Debt, Weighted Average USD ($)	Dec. 31, 2014 Notes 2.70 Percent Due 2022 USD ($)	Dec. 31, 2013 Notes 2.70 Percent Due 2022 USD ($)	Mar. 31, 2013 Notes Five Point Seven Five Percent Due Twenty Thirteen [Member] USD ($)	Dec. 31, 2014 Credit Agreement [Member]	Dec. 31, 2013 Credit Agreement [Member]	Dec. 31, 2014 Revolving Credit Facility Credit Agreement [Member] USD ($)
Debt Instrument [Line Items]
Typical Grace Period for Debt Payments Under Debt Provisions	10 years
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 366,000,000	$ 366,000,000
Repayments of Debt		1,489,000,000	605,000,000	71,000,000																																										600,000,000
Early Repayment of Long-term Debt, Principal Amount										146,000,000		75,000,000						575,000,000		199,000,000							16,000,000						74,000,000											400,000,000
Payment of Premiums to Early Retire Debt, Public Notes		179,000,000
Proceeds from Bank Debt														620,000,000
Proceeds from Issuance of Debt																						297,000,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate															0.70%
Effective interest rates	3.90%	3.90%	4.10%
Debt instrument, face amount																500,000,000							300,000,000								80,000,000							120,000,000
Debt instrument, term																													15 years								30 years										5 years	5 years
Long-term debt	3,877,000,000	3,877,000,000	3,346,000,000			364,000,000	413,000,000	250,000,000	249,000,000	0	146,000,000	0	74,000,000		605,000,000		0	125,000,000	700,000,000	0	198,000,000	299,000,000		0	496,000,000	495,000,000	133,000,000	149,000,000		96,000,000		0	175,000,000	249,000,000	248,000,000	248,000,000	137,000,000		0	9,000,000	21,000,000	5,000,000	4,000,000	0	400,000,000
Long-term Commercial Paper, Noncurrent	935,000,000	935,000,000	0
Capital lease obligations	33,000,000	33,000,000	30,000,000
Long-term debt	3,910,000,000	3,910,000,000	3,376,000,000
Less payments due within one year	366,000,000	366,000,000	4,000,000
Long-term debt	3,544,000,000	3,544,000,000	3,372,000,000
Debt instrument, interest rate, stated percentage					5.75%	3.875%		1.90%		7.375%		6.875%						6.65%		7.40%			2.30%		3.60%		9.00%				2.50%		7.70%		5.50%			3.00%				2.30%	0.70%	2.70%
Debt Proceeds Used in Early Retirement of Existing Long-term Debt	1,200,000,000
Principal amount of debt redeemed via tender offer for each $1,000 of principal offered																											1,334,000,000						0
Aggregate amount of principal of debt redeemed via tender offer		90,000,000
Debt Redemption Price Percent Of Principal Amount																							101.00%
Proceeds from Notes Payable																													99,000,000								142,000,000
Proceeds from Debt, Net of Issuance Costs		1,158,000,000
Aggregate amount of principal of debt redeemed		1,500,000,000
Payments of Debt Extinguishment Costs		43,000,000
Debt refinancing charge		317,000,000	0	0
Aggregate maturities of long-term debt, in 2014	253,000,000	253,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	608,000,000	608,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	127,000,000	127,000,000
Aggregate maturities of long-term debt, in 2017	303,000,000	303,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,318,000,000	1,318,000,000
Payments of Debt Extinguishment Costs		1,707,000,000
Unamortized interest rate swaps and forward starting swap losses	89,000,000
Realization of unamortized fees and discounts	6,000,000
Line of credit facility, additional borrowing capacity available to lender conditions																																																	300,000,000
Revolving credit facility outstanding																																																	$ 1,500,000,000.0