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Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities | $ 5,728 | $ 5,035 | [1]
Cash Flows from Investing Activities: |  |  |
Capital expenditures | (3,336) | (2,496) | [1]
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt | 1,109 | 1,241 | [1]
Principal payments under finance leases | $ (105) | (57) | [1]
As Reported |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | 5,080 |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | (2,592) |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | 1,332 |
Principal payments under finance leases |  | (98) |
New Lease Standard | Adjustments |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | (45) |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | 96 |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | (91) |
Principal payments under finance leases |  | $ 41 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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