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Nature of Operations and Significant Accounting Policies - Restructuring Charges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge | $ 0 | $ 110
Restructuring Charges Nonoperating | $ 0 | 63
Management Streamlining Initiative |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 110
Restructuring Charges Nonoperating |  | 63
Management Streamlining Initiative | Subtotal Management Workforce Reduction |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 92
Restructuring Charges Nonoperating |  | 63
Management Streamlining Initiative | Severance and Pension |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 81
Restructuring Charges Nonoperating |  | 50
Management Streamlining Initiative | Other Post-Retirement Benefits Curtailment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 0
Restructuring Charges Nonoperating |  | 13
Management Streamlining Initiative | Employee Equity Awards Proration and Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 11
Restructuring Charges Nonoperating |  | 0
Management Streamlining Initiative | Executive Equity Awards Proration |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 8
Restructuring Charges Nonoperating |  | 0
Management Streamlining Initiative | Advisory Fees Related to Shareholder Matters |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 10
Restructuring Charges Nonoperating |  | 0
As Previously Reported |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 173
Restructuring Charges Nonoperating |  | 0
As Previously Reported | Management Streamlining Initiative |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 173
As Previously Reported | Management Streamlining Initiative | Subtotal Management Workforce Reduction |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 155
As Previously Reported | Management Streamlining Initiative | Severance and Pension |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 131
As Previously Reported | Management Streamlining Initiative | Other Post-Retirement Benefits Curtailment |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 13
As Previously Reported | Management Streamlining Initiative | Employee Equity Awards Proration and Other |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 11
As Previously Reported | Management Streamlining Initiative | Executive Equity Awards Proration |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | 8
As Previously Reported | Management Streamlining Initiative | Advisory Fees Related to Shareholder Matters |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Charge |  | $ 10

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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