Long-Term Debt and Short-Term Borrowings (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 Current portion of long-term debt USD ($)	Dec. 31, 2013 Current portion of long-term debt USD ($)	Dec. 31, 2014 Commercial paper USD ($)	Dec. 31, 2013 Commercial paper USD ($)	Dec. 31, 2014 Other borrowings USD ($)	Dec. 31, 2013 Other borrowings USD ($)	Dec. 31, 2014 Fixed-rate debt USD ($)	Dec. 31, 2013 Fixed-rate debt USD ($)	Dec. 31, 2014 Floating-rate debt USD ($)	Dec. 31, 2013 Floating-rate debt USD ($)	Dec. 31, 2014 Fixed rate Eurobond which matured in July 2014 USD ($)	Dec. 31, 2014 Fixed rate Eurobond which matured in July 2014 EUR (€)	Dec. 31, 2013 Fixed rate Eurobond which matured in July 2014 USD ($)	Dec. 31, 2014 Floating rate Eurobond which matured in July 2014 USD ($)	Dec. 31, 2014 Floating rate Eurobond which matured in July 2014 EUR (€)	Dec. 31, 2013 Floating rate Eurobond which matured in July 2014 USD ($)	Dec. 31, 2014 Fixed rate Medium term note due 2016 USD ($)	Dec. 31, 2013 Fixed rate Medium term note due 2016 USD ($)	Dec. 31, 2014 Fixed rate Euro Medium term note due 2026 USD ($)	Dec. 31, 2014 Fixed rate Euro Medium term note due 2026 EUR (€)	Dec. 31, 2013 Fixed rate Euro Medium term note due 2026 USD ($)	Dec. 31, 2014 Fixed rate Eurobond Due 2021 USD ($)	Dec. 31, 2014 Fixed rate Eurobond Due 2021 EUR (€)	Dec. 31, 2013 Fixed rate Eurobond Due 2021 USD ($)	Dec. 31, 2014 Floating rate Eurobond Due 2021 USD ($)	Dec. 31, 2014 Floating rate Eurobond Due 2021 EUR (€)	Dec. 31, 2013 Floating rate Eurobond Due 2021 USD ($)	Dec. 31, 2014 Fixed rate 30-year bond due 2037 USD ($)	Dec. 31, 2013 Fixed rate 30-year bond due 2037 USD ($)	Dec. 31, 2014 Fixed rate medium term note due 2017 USD ($)	Dec. 31, 2013 Fixed rate medium term note due 2017 USD ($)	Dec. 31, 2014 Fixed rate medium term note due 2019 USD ($)	Jun. 30, 2014 Fixed rate medium term note due 2019 USD ($)	Dec. 31, 2013 Fixed rate medium term note due 2019 USD ($)	Dec. 31, 2014 Floating rate medium term note due 2019 USD ($)	Dec. 31, 2013 Floating rate medium term note due 2019 USD ($)	Dec. 31, 2014 Floating rate Euro Medium term note due 2018 USD ($)	Dec. 31, 2014 Floating rate Euro Medium term note due 2018 EUR (€)	Dec. 31, 2013 Floating rate Euro Medium term note due 2018 USD ($)	Dec. 31, 2014 Fixed rate medium term note due 2022 USD ($)	Dec. 31, 2013 Fixed rate medium term note due 2022 USD ($)	Dec. 31, 2014 Fixed rate 30-year debenture due 2028 USD ($)	Dec. 31, 2013 Fixed rate 30-year debenture due 2028 USD ($)	Dec. 31, 2014 Fixed rate medium term note due 2044 USD ($)	Dec. 31, 2013 Fixed rate medium term note due 2044 USD ($)	Dec. 31, 2014 Floating Rate UK Borrowing repaid December 2014 USD ($)	Dec. 31, 2014 Floating Rate UK Borrowing repaid December 2014 GBP (£)	Dec. 31, 2013 Floating Rate UK Borrowing repaid December 2014 USD ($)	Dec. 31, 2014 Floating rate note due 2041 USD ($)	Dec. 31, 2013 Floating rate note due 2041 USD ($)	Dec. 31, 2014 Floating rate note due 2044 USD ($)	Dec. 31, 2013 Floating rate note due 2044 USD ($)	Dec. 31, 2004 Floating rate note due 2044 USD ($)	Dec. 31, 2014 Various fixed and floating rate Other borrowings due 2015-2040 USD ($)	Dec. 31, 2013 Various fixed and floating rate Other borrowings due 2015-2040 USD ($)	Dec. 31, 2013 Eurobond 750 Million Euros Issued July 2007 USD ($)	Jul. 31, 2007 Eurobond 750 Million Euros Issued July 2007 EUR (€)	Dec. 31, 2013 Eurobond 275 Million Euros Issued December 2007 USD ($)	Dec. 31, 2007 Eurobond 275 Million Euros Issued December 2007 EUR (€)	Dec. 31, 2014 Eurobond 600 Million Euros Issued November 2013 USD ($)	Nov. 30, 2013 Eurobond 600 Million Euros Issued November 2013 EUR (€)
Long-Term Debt
Principal amount														€ 775,000,000			€ 250,000,000		$ 1,000,000,000			€ 750,000,000			€ 300,000,000			€ 300,000,000		$ 750,000,000		$ 650,000,000		$ 600,000,000	$ 625,000,000		$ 25,000,000			€ 500,000,000		$ 600,000,000		$ 330,000,000		$ 325,000,000			£ 66,000,000		$ 96,000,000		$ 55,000,000		$ 60,000,000			$ 1,042,000,000	€ 750,000,000	$ 382,000,000	€ 275,000,000	$ 753,000,000	€ 600,000,000
Interest rate - effective							2.46%		2.74%	3.19%	0.53%	0.48%							1.62%		1.71%	1.71%		1.97%	1.97%		0.40%	0.40%		5.73%		1.10%		0.28%			1.74%		0.31%	0.31%		2.17%		6.01%		4.05%										4.17%
Total long-term debt			55,000,000	1,586,000,000					4,933,000,000	4,821,000,000	1,853,000,000	1,091,000,000	0		1,075,000,000	0		349,000,000	997,000,000	995,000,000	897,000,000		0	363,000,000		411,000,000	390,000,000		404,000,000	748,000,000	748,000,000	649,000,000	648,000,000	594,000,000		0	25,000,000	0	608,000,000		0	593,000,000	592,000,000	344,000,000	346,000,000	315,000,000	0	0		109,000,000	96,000,000	97,000,000	55,000,000	59,000,000		112,000,000	79,000,000
Long-term debt - excluding current portion - carrying value	6,731,000,000	4,326,000,000
Short-Term Borrowings and Current Portion of Long-Term Debt
Total short-term borrowings and current portion of long-term debt	106,000,000	1,683,000,000			0	0	51,000,000	97,000,000
Maturities of long-term debt
2015	55,000,000
2016	1,109,000,000
2017	745,000,000
2018	608,000,000
2019	622,000,000
After 2019	3,647,000,000
Floating rate note payments due in 2015	55,000,000
Floating rate note payments due in 2016	71,000,000
Floating rate note payments due in 2017	$ 96,000,000