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Nature of Operations and Significant Accounting Policies - Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge | $ 0 | $ 1 | $ 0 | $ 226
Restructuring Charges Nonoperating | $ 0 | 0 | $ 0 | 70
Management Streamlining Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 226
Restructuring Charges Nonoperating |  |  |  | 70
Management Streamlining Initiative | Subtotal Management Workforce Reduction |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 107
Restructuring Charges Nonoperating |  |  |  | 70
Management Streamlining Initiative | Severance and Pension |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 91
Restructuring Charges Nonoperating |  |  |  | 53
Management Streamlining Initiative | Other Post-Retirement Benefits Curtailment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 0
Restructuring Charges Nonoperating |  |  |  | 17
Management Streamlining Initiative | Employee Equity Awards Proration and Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 16
Restructuring Charges Nonoperating |  |  |  | 0
Management Streamlining Initiative | Reimbursement Arrangements |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 84
Restructuring Charges Nonoperating |  |  |  | 0
Management Streamlining Initiative | Executive Equity Awards Proration |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 24
Restructuring Charges Nonoperating |  |  |  | 0
Management Streamlining Initiative | Advisory Fees Related to Shareholder Matters |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 11
Restructuring Charges Nonoperating |  |  |  | 0
As Previously Reported |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  | 1 |  | 296
Restructuring Charges Nonoperating |  | $ 0 |  | 0
As Previously Reported | Management Streamlining Initiative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 296
As Previously Reported | Management Streamlining Initiative | Subtotal Management Workforce Reduction |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 177
As Previously Reported | Management Streamlining Initiative | Severance and Pension |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 144
As Previously Reported | Management Streamlining Initiative | Other Post-Retirement Benefits Curtailment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 17
As Previously Reported | Management Streamlining Initiative | Employee Equity Awards Proration and Other |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 16
As Previously Reported | Management Streamlining Initiative | Reimbursement Arrangements |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 84
As Previously Reported | Management Streamlining Initiative | Executive Equity Awards Proration |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | 24
As Previously Reported | Management Streamlining Initiative | Advisory Fees Related to Shareholder Matters |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charge |  |  |  | $ 11

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