v3.19.3.a.u2
Leases (Other Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Operating Lease [Member]    
Lessee Lease Description [Line Items]    
Cash flows from operating activities $ 1,116  
Cash flow from investing activities 258  
For January 1 adoption of Topic 842   $ 3,263
Operating right-of-use assets obtained in exchange for new lease liabilities 3,663  
Drilling Rigs and Related Equipment [Member]    
Lessee Lease Description [Line Items]    
Cash flow from investing activities 258  
For January 1 adoption of Topic 842   445
Operating right-of-use assets obtained in exchange for new lease liabilities 350  
Other [Member]    
Lessee Lease Description [Line Items]    
Cash flows from operating activities 1,116  
For January 1 adoption of Topic 842   $ 2,818
Operating right-of-use assets obtained in exchange for new lease liabilities 3,313  
Finance Lease Paid To Equity Company [Member]    
Lessee Lease Description [Line Items]    
Cash flows from operating activities - finance leases 54  
Finance Lease Paid To Third Parties [Member]    
Lessee Lease Description [Line Items]    
Cash flow from financing activities 177  
Finance right-of-use assets obtained in exchange for new lease liabilities $ 422