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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
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.