Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful receivables	$ 117	$ 110
Investments carried at fair value	1,512	1,959
Other intangible assets, accumulated amortization	$ 5,161	$ 4,295
Common stock authorized (in shares)	100	1,500,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 2.50
Common stock issued (in shares)	100	1,242,794,836
Treasury stock (in shares)	0	31,661,501
Primary Beneficiary | Cash and Cash Equivalents
Pledged current assets	$ 107	$ 75
Primary Beneficiary | Property, Plant and Equipment
Pledged noncurrent assets	907	961
Primary Beneficiary | Long-term Debt
Noncurrent liabilities - nonrecourse	$ 249	$ 330