Summary of Significant Accounting Policies, Nature of Operations and Other Developments (Tables)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

Schedule of Change in Accounting Policy

The following tables show the affected line items within the consolidated financial statements:

	December 31, 2015
(Dollars in millions)	As Previously Reported		Adjustment			As Corrected
Other assets	$	5,377	$	10		$	5,387
Other liabilities	2,023		(6		)	2,017
Retained earnings	8,854		(18		)	8,836
Noncontrolling interests	181		34			215

	December 31, 2014
(Dollars in millions)	As Previously Reported		Adjustment			As Corrected
Other assets	$	4,630	$	10		$	4,640
Other liabilities	1,897		(6		)	1,891
Retained earnings	8,283		(18		)	8,265
Noncontrolling interests	230		34			264