Long-Term Borrowings and Capital Lease Obligations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Medium-term notes due 2013-2041 [Member]		Dec. 31, 2012 Medium-term notes due 2013-2041 [Member]		Dec. 31, 2013 5.00% notes due 2013, Note 1 [Member]		Dec. 31, 2012 5.00% notes due 2013, Note 1 [Member]		Dec. 31, 2013 5.00% notes due 2013, Note 2 [Member]		Dec. 31, 2012 5.00% notes due 2013, Note 2 [Member]		Dec. 31, 2013 5.875% notes due 2014 [Member]		Dec. 31, 2012 5.875% notes due 2014 [Member]		Dec. 31, 2013 1.75% notes due 2014 [Member]		Dec. 31, 2012 1.75% notes due 2014 [Member]		Dec. 31, 2013 Floating rate notes due 2014 [Member]		Dec. 31, 2012 Floating rate notes due 2014 [Member]		Dec. 31, 2013 4.875% notes due 2014 [Member]		Dec. 31, 2012 4.875% notes due 2014 [Member]		Dec. 31, 2013 3.25% notes due 2015 [Member]		Dec. 31, 2012 3.25% notes due 2015 [Member]		Dec. 31, 2013 3.25% notes due 2015 [Member] Interest Rate Swap [Member]	Dec. 31, 2012 3.25% notes due 2015 [Member] Interest Rate Swap [Member]	Dec. 31, 2013 4.75% notes due 2015 [Member]	Dec. 31, 2012 4.75% notes due 2015 [Member]	Dec. 31, 2013 1.95% notes due 2016 [Member]	Dec. 31, 2012 1.95% notes due 2016 [Member]	Dec. 31, 2013 2.75% notes due 2016 [Member]	Dec. 31, 2012 2.75% notes due 2016 [Member]	Dec. 31, 2013 5.25% notes due 2016 [Member]	Dec. 31, 2012 5.25% notes due 2016 [Member]	Dec. 31, 2013 6.00% notes due 2018 [Member]		Dec. 31, 2012 6.00% notes due 2018 [Member]		Dec. 31, 2008 6.00% notes due 2018 [Member] Interest Rate Swap [Member]	Dec. 31, 2013 5.75% notes due 2019 [Member]	Dec. 31, 2012 5.75% notes due 2019 [Member]	Dec. 31, 2013 4.625% notes due 2020 [Member]	Dec. 31, 2012 4.625% notes due 2020 [Member]	Dec. 31, 2013 3.625% notes due 2021 [Member]	Dec. 31, 2012 3.625% notes due 2021 [Member]	Dec. 31, 2013 4.25% notes due 2021 [Member]	Dec. 31, 2012 4.25% notes due 2021 [Member]	Dec. 31, 2013 2.80% notes due 2023 [Member]	Mar. 31, 2013 2.80% notes due 2023 [Member]	Dec. 31, 2012 2.80% notes due 2023 [Member]	Dec. 31, 2013 6.50% debentures due 2028 [Member]	Dec. 31, 2012 6.50% debentures due 2028 [Member]	Dec. 31, 2013 5.60% notes due 2036 [Member]	Dec. 31, 2012 5.60% notes due 2036 [Member]	Dec. 31, 2013 4.90% notes due 2041 [Member]	Dec. 31, 2012 4.90% notes due 2041 [Member]	Dec. 31, 2013 4.15% notes due 2043 [Member]	Mar. 31, 2013 4.15% notes due 2043 [Member]	Dec. 31, 2012 4.15% notes due 2043 [Member]	Dec. 31, 2013 Other Loans [Member]		Dec. 31, 2012 Other Loans [Member]		Dec. 31, 2013 Other Loans, Various Currencies [Member]		Dec. 31, 2012 Other Loans, Various Currencies [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							5.00%		5.00%		5.00%		5.00%		5.875%		5.875%		1.75%		1.75%						4.875%		4.875%		3.25%		3.25%				4.75%	4.75%	1.95%	1.95%	2.75%	2.75%	5.25%	5.25%	6.00%		6.00%			5.75%	5.75%	4.625%	4.625%	3.625%	3.625%	4.25%	4.25%	2.80%	2.80%	2.80%	6.50%	6.50%	5.60%	5.60%	4.90%	4.90%	4.15%	4.15%	4.15%
Medium-term notes			$ 121	[1],[2]	$ 374	[1],[2]
Senior notes							0	[2]	250	[2]	0	[2]	749	[2]	170	[2]	170	[2]	400	[2]	400	[2]	600	[2],[3]	600	[2],[3]	500	[2]	499	[2]	1,028	[4]	1,054	[4]			400	400	498	497	500	499	599	599	1,361	[5]	1,383	[5]		499	499	997	997	999	999	499	499	1,250	1,250	0			395	395	494	493	749	750	0
Debenture notes																																																													299	299
Other loans																																																																						33	[2]	36	[2]	1	[2]	2	[2]
Total long-term debt	12,392	11,693
Less short-term portion of long-term debt	1,674	1,252
Total long-term debt less current maturities	10,718	10,441
Capital lease obligations	23	24
Total long-term debt and capital lease obligations	10,741	10,465
Average interest rate			0.00%		4.00%																																																																	4.20%
Interest rate on floating rate notes																							0.70%		0.70%
Notional amount of interest rate swaps																																			1,000	1,000
Fair value of interest rate swaps, asset																																			$ 29	$ 55
Effective yield of interest rate swap																																																	3.85%

[1] Average interest rates on medium-term notes at December 31, 2013 and 2012 were 0.0% and 4.0%, respectively.

[2] Includes long-term debt due within one year.

[3] Interest rate on floating rate notes at December 31, 2013 and 2012 was 0.7%.

[4] At December 31, 2013 and 2012, the company had outstanding interest rate swap agreements with gross notional amounts of $1,000. Over the remaining terms of the notes, the company will receive fixed payments equivalent to the underlying debt and pay floating payments based on USD LIBOR (London Interbank Offered Rate). The fair value of outstanding swaps was an asset of $29 and $55 at December 31, 2013 and 2012, respectively.

[5] During 2008, the interest rate swap agreement associated with these notes was terminated. The gain will be amortized over the remaining life of the bond, resulting in an effective yield of 3.85%.