Correction of Prior Period Amounts (Tables)

12 Months Ended

Dec. 31, 2016

Accounting Changes and Error Corrections [Abstract]

Schedule of Change in Accounting Estimate

The following tables show the affected line items within the consolidated financial statements presented in this Form 10-K:

	December 31, 2015
(Dollars in millions)	As Previously Reported		Adjustment			As Corrected
Other assets	$	6,527	$	10		$	6,537
Other liabilities	2,257		(6		)	2,251
Retained earnings	9,134		(18		)	9,116
Noncontrolling interests	181		34			215

	December 31, 2014
(Dollars in millions)	As Previously Reported		Adjustment			As Corrected
Retained earnings	$	8,491	$	(18	)	$	8,473
Noncontrolling interests	230		34			264

	December 31, 2013
(Dollars in millions)	As Previously Reported		Adjustment			As Corrected
Retained earnings	$	7,699	$	(18	)	$	7,681
Noncontrolling interests	253		34			287