v3.19.3.a.u2
Leases (Lease Cost) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Operating Lease [Member]  
Operating Leased Assets [Line Items]  
Operating lease cost $ 1,434
Short-term and other (net of sublease rental income) 2,042
Total 3,476
Drilling Rigs and Related Equipment [Member]  
Operating Leased Assets [Line Items]  
Operating lease cost 238
Short-term and other (net of sublease rental income) 926
Total 1,164
Other [Member]  
Operating Leased Assets [Line Items]  
Operating lease cost 1,196
Short-term and other (net of sublease rental income) 1,116
Total 2,312
Finance Lease [Member]  
Operating Leased Assets [Line Items]  
Amortization of right-of-use assets 121
Interest on lease liabilities 133
Total $ 254