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Nature of Operations and Significant Accounting Policies - Restructuring Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge | $ 0 | $ 0 | $ 240
Non-Operating Restructuring Charge | $ 0 | $ 0 | 85
Management streamlining |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 240
Non-Operating Restructuring Charge |  |  | 85
Management streamlining | Subtotal Management Workforce Reduction |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 121
Non-Operating Restructuring Charge |  |  | 73
Management streamlining | Severance and Pension |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 98
Non-Operating Restructuring Charge |  |  | 56
Management streamlining | Other Post-Retirement Benefits Curtailment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 0
Non-Operating Restructuring Charge |  |  | 17
Management streamlining | Employee Equity Awards Proration and Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 23
Non-Operating Restructuring Charge |  |  | 0
Management streamlining | Reimbursement Arrangements |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 84
Non-Operating Restructuring Charge |  |  | 0
Management streamlining | Executive Equity Awards Proration |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 24
Non-Operating Restructuring Charge |  |  | 0
Management streamlining | Pension Settlement Charge |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 0
Non-Operating Restructuring Charge |  |  | 12
Management streamlining | Advisory Fees Related to Shareholder Matters |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  |  | 11
Non-Operating Restructuring Charge |  |  | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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=115931487&loc=d3e140904-122747 + Details
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