Summary Of Business And Significant Accounting Policies Schedule of New Accounting Pronoucments and Changes in Accounting Principles (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The adoption of this guidance had the following impact on the Company's consolidated balance sheet:

In millions, except per share amounts	2016			2015
Reclassification from:
Deferred income tax assets	$	(299	)	$	(312	)
Other accrued liabilities	3			3
Reclassification to:
Deferred charges and other assets	48			52
Deferred income taxes	248			257