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Nature of Operations and Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Restructuring Charges

 
First Quarters
(Dollars in millions)
2017
2016
Severance and Pension
$
131

$
—

Other Post-retirement Benefits Curtailment
13

—

Employee Equity Awards Proration and Other
11

—

Subtotal Management Workforce Reduction
$
155

—

Executive Equity Awards Proration
8

—

Advisory Fees Related to Shareholder Matters
10

—

Total Restructuring Charge
$
173

—