Borrowings: (Short-Term Debt) (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Borrowings
Commercial paper	$ 6,549	$ 2,458
Short-term loans	437	551
Long-term debt - current maturities	5,477	3,854
Short Term Debt	12,462	6,862
Default provision on credit facility	$ 500
Debt Disclosure
Tangible assets ratio	10.00%
Commercial paper
Debt Disclosure
Weighted-average interest rates for short-term loans (as a percent)	0.10%	0.10%
Short-term loans
Debt Disclosure
Weighted-average interest rates for short-term loans (as a percent)	7.20%	5.10%
Minimum
Debt Disclosure
Net interest expense ratio	2.20 to 1.0