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Basis of Presentation and Significant Accounting Policies - Impact of Adoption of Accounting Standards Related to Classification of Certain Transactions in the Statement of Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2018 | Oct. 01, 2017
Operating Activities |  |  |
Other adjustments, net | [1] | $ (1,169) | $ (604)
Other changes in assets and liabilities, net of acquisitions and divestitures | [1] | (2,441) | (3,616)
Investing Activities |  |  |
Proceeds from redemptions/sales of short-term investments | [1] | 12,752 | 5,778
Proceeds from redemptions/sales of long-term investments | [1] | 2,174 | 2,403
Financing Activities |  |  |
Principal payments on short-term borrowings | [1] | (4,239) | (7,659)
Net proceeds from short-term borrowings with original maturities of three months or less | [1] | (973) | 566
Net increase in cash and cash equivalents and restricted cash and cash equivalents | [1] | 2,227 | 193
Cash and cash equivalents and restricted cash and cash equivalents, beginning | [1] | 1,431 | 2,666
Cash and cash equivalents and restricted cash and cash equivalents, end | [1] | 3,658 | 2,858
As Previously Reported [Member] |  |  |
Operating Activities |  |  |
Other adjustments, net |  |  | (561)
Other changes in assets and liabilities, net of acquisitions and divestitures |  |  | (3,644)
Investing Activities |  |  |
Proceeds from redemptions/sales of short-term investments |  |  | 5,783
Proceeds from redemptions/sales of long-term investments |  |  | 2,417
Financing Activities |  |  |
Principal payments on short-term borrowings |  |  | (7,691)
Net proceeds from short-term borrowings with original maturities of three months or less |  |  | 555
Net increase in cash and cash equivalents and restricted cash and cash equivalents |  |  | 184
Cash and cash equivalents and restricted cash and cash equivalents, beginning |  |  | 2,595
Cash and cash equivalents and restricted cash and cash equivalents, end |  |  | 2,779
Cash Flow Classification [Member] | Effect of Change Higher/(Lower) [Member] |  |  |
Operating Activities |  |  |
Other adjustments, net |  |  | (43)
Financing Activities |  |  |
Principal payments on short-term borrowings |  |  | 33
Net proceeds from short-term borrowings with original maturities of three months or less |  |  | 10
Restricted Cash [Member] |  |  |
Financing Activities |  |  |
Net increase in cash and cash equivalents and restricted cash and cash equivalents |  | $ 10 |
Restricted Cash [Member] | Effect of Change Higher/(Lower) [Member] |  |  |
Operating Activities |  |  |
Other changes in assets and liabilities, net of acquisitions and divestitures |  |  | 28
Investing Activities |  |  |
Proceeds from redemptions/sales of short-term investments |  |  | (5)
Proceeds from redemptions/sales of long-term investments |  |  | (14)
Financing Activities |  |  |
Net increase in cash and cash equivalents and restricted cash and cash equivalents |  |  | 9
Cash and cash equivalents and restricted cash and cash equivalents, beginning |  |  | 70
Cash and cash equivalents and restricted cash and cash equivalents, end |  |  | $ 79
[1] | Amounts may not add due to rounding.

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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