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Pensions and Other Benefit Plans - Information Related to the Benefit Obligation and the Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jan. 01, 2017
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Qualified Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | $ 18,681 | $ 16,057
Projected Benefit Obligation | 19,652 | 16,336
Accumulated Benefit Obligation | 17,654 | 14,759
Projected Benefit Obligation | (971) | (279)
Accumulated Benefit Obligation | 1,027 | 1,298
Non-Qualified Plans | U.S. Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 0 | 0
Projected Benefit Obligation | 2,257 | 1,905
Accumulated Benefit Obligation | 1,849 | 1,568
Projected Benefit Obligation | (2,257) | (1,905)
Accumulated Benefit Obligation | (1,849) | (1,568)
Funded Plans | International Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 9,723 | 7,576
Projected Benefit Obligation | 10,863 | 9,502
Accumulated Benefit Obligation | 9,893 | 8,663
Projected Benefit Obligation | (1,140) | (1,926)
Accumulated Benefit Obligation | (170) | (1,087)
Unfunded Plans | International Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 0 | 0
Projected Benefit Obligation | 449 | 373
Accumulated Benefit Obligation | 397 | 329
Projected Benefit Obligation | (449) | (373)
Accumulated Benefit Obligation | $ (397) | $ (329)

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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