Leases - Supplemental information (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Supplemental balance sheet information
Balance sheet location for operating lease assets		Other current assets	Other current assets
Operating lease right-of-use assets	$ 406		$ 302
Balance sheet location for operating lease current liabilities		Other current liabilities	Other current liabilities
Current operating lease liabilities	79		$ 63
Balance sheet location for operating lease noncurrent liabilities		Other liabilities	Other liabilities
Noncurrent operating lease liabilities	329		$ 232
Finance lease ROU assets, net	10		11
Current finance lease liabilities	2		2
Noncurrent finance lease liabilities	$ 8		$ 10