Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000018230 (http://www.sec.gov/CIK)

Income Tax Disclosure [Abstract]	Period [Axis]
	2013-12-31	2012-12-31	2011-12-31
Income Tax Disclosure [Abstract]
Deferred income taxes as of year end
Deferred tax assets
Deferred and refundable income taxes	877,000,000	979,000,000	1,044,000,000
Noncurrent deferred and refundable income taxes	456,000,000	1,863,000,000	2,005,000,000
Total deferred tax assets	1,333,000,000	2,842,000,000	3,049,000,000
Deferred tax liabilities
Other current liabilities	86,000,000	66,000,000	69,000,000
Other liabilities	447,000,000	484,000,000	559,000,000
Deferred income taxes-net	800,000,000	2,292,000,000	2,421,000,000