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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 | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities | $ 1,915 | $ 1,709 | [1]
Cash Flows from Investing Activities: |  |  |
Capital expenditures | (1,609) | (944) | [1]
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt | 646 | 673 | [1]
Principal payments under finance leases | $ (20) | (18) | [1]
As Reported |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | 1,733 |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | (979) |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | 696 |
Principal payments under finance leases |  | (30) |
New Lease Standard | Adjustments |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | (24) |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | 35 |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | (23) |
Principal payments under finance leases |  | $ 12 |
[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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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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