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Nature of Operations and Significant Accounting Policies - Restructuring Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge | $ 0 | $ 240 | $ 0
Non-Operating Restructuring Charge | $ 0 | 85 | 0
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 |
As Previously Reported |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 325 | 0
Non-Operating Restructuring Charge |  | 0 | $ 0
As Previously Reported | Management streamlining |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 325 |
As Previously Reported | Management streamlining | Subtotal Management Workforce Reduction |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 194 |
As Previously Reported | Management streamlining | Severance and Pension |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 154 |
As Previously Reported | Management streamlining | Other Post-Retirement Benefits Curtailment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 17 |
As Previously Reported | Management streamlining | Employee Equity Awards Proration and Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 23 |
As Previously Reported | Management streamlining | Reimbursement Arrangements |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 84 |
As Previously Reported | Management streamlining | Executive Equity Awards Proration |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 24 |
As Previously Reported | Management streamlining | Pension Settlement Charge |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | 12 |
As Previously Reported | Management streamlining | Advisory Fees Related to Shareholder Matters |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Operating Restructuring Charge |  | $ 11 |

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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=109223946&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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