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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, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 23, 2016 | Sep. 30, 2017 | Sep. 23, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | $ 1 |  |  | $ 0 | $ 296 | $ 0
Payments |  |  |  |  | (147) | $ 0
Management Streamlining Initiative |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 1 | $ 122 | $ 173 |  | 296 |
Payments |  |  |  |  | (147) |
Non-cash Items |  |  |  |  | (102) |
Balance | 47 |  |  |  | 47 |
Management Streamlining Initiative | Subtotal Management Workforce Reduction |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 22 | 155 |  | 177 |
Payments |  |  |  |  | (81) |
Non-cash Items |  |  |  |  | (78) |
Balance | 18 |  |  |  | 18 |
Management Streamlining Initiative | Severance |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 10 | 81 |  | 91 |
Payments |  |  |  |  | (77) |
Non-cash Items |  |  |  |  | 0 |
Balance | 14 |  |  |  | 14 |
Management Streamlining Initiative | Pension, Other Post-retirement Benefit and Other Non-cash Charges |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 10 | 68 |  | 78 |
Payments |  |  |  |  | 0 |
Non-cash Items |  |  |  |  | (78) |
Balance | 0 |  |  |  | 0 |
Management Streamlining Initiative | Relocation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 2 | 6 |  | 8 |
Payments |  |  |  |  | (4) |
Non-cash Items |  |  |  |  | 0 |
Balance | 4 |  |  |  | 4 |
Management Streamlining Initiative | Reimbursement Arrangements |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 84 | 0 |  | 84 |
Payments |  |  |  |  | (55) |
Non-cash Items |  |  |  |  | 0 |
Balance | 29 |  |  |  | 29 |
Management Streamlining Initiative | Non-cash Executive Equity Awards Proration |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 0 | 16 | 8 |  | 24 |
Payments |  |  |  |  | 0 |
Non-cash Items |  |  |  |  | (24) |
Balance | 0 |  |  |  | 0 |
Management Streamlining Initiative | Other Charges Including Fees Related to Shareholder Matters |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring Charge | 1 | $ 0 | $ 10 |  | 11 |
Payments |  |  |  |  | (11) |
Non-cash Items |  |  |  |  | 0 |
Balance | $ 0 |  |  |  | $ 0 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with 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 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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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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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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