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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 | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities | $ 4,625 | $ 4,152 | [1]
Cash Flows from Investing Activities: |  |  |
Capital expenditures | (2,467) | (1,671) | [1]
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt | 996 | 1,241 | [1]
Principal payments under finance leases | $ (63) | (35) | [1]
As Reported |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | 4,175 |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | (1,734) |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | 1,308 |
Principal payments under finance leases |  | (62) |
New Lease Standard | Adjustments |  |  |
Cash Flows from Operating Activities: |  |  |
Net cash provided by operating activities |  | (23) |
Cash Flows from Investing Activities: |  |  |
Capital expenditures |  | 63 |
Cash Flows from Financing Activities: |  |  |
Proceeds from issuance of long-term debt |  | (67) |
Principal payments under finance leases |  | $ 27 |
[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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