Leases - Balance Sheet Location Table (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Right-of-use assets—Operating	$ 1,181	$ 759
Total right-of-use assets	1,233	812
Current operating lease liabilities	251	161
Non-current operating lease liabilities	928	597
Non-current finance lease liabilities	57	57
Total lease liabilities	1,238	817
Operating lease assets, net [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets—Operating	1,181	759
Property, plant and equipment, net [Member]
Lessee, Lease, Description [Line Items]
Right-of-use assets—Financing	52	53
Current operating lease liabilities [Member]
Lessee, Lease, Description [Line Items]
Current operating lease liabilities	251	161
Other current liabilities [Member]
Lessee, Lease, Description [Line Items]
Current finance lease liabilities	2	2
Non-current operating lease liabilities [Member]
Lessee, Lease, Description [Line Items]
Non-current operating lease liabilities	928	597
Non-current finance lease liabilities [Member]
Lessee, Lease, Description [Line Items]
Non-current finance lease liabilities	$ 57	$ 57