Revenue Contract Balances (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Revenue [Abstract]
Contract with Customer, Liability		$ 531	$ 117
Contract with Customer, Liability, Revenue Recognized		14	13
Loan receivable, net of allowance of $0		0	1,351
Disaggregation of Revenue [Line Items]
Loan receivable, net of allowance of $0		0	1,351
Contract with Customer, Liability		531	117
Financing Receivable, after Allowance for Credit Loss		101	109
Angamos [Member]
Revenue [Abstract]
Contract with Customer, Liability	$ 655	383
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability	655	383
Servicing Liability at Amortized Cost, Amortization	$ 55
Mong Duong Subsidiary [Member]
Disaggregation of Revenue [Line Items]
Financing Receivable, before Allowance for Credit Loss and Fee			$ 1,400
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Mong Duong held-dfor-sale [Member]
Disaggregation of Revenue [Line Items]
Accounts Receivable, Allowance for Credit Loss		32
Financing Receivable, after Allowance for Credit Loss, Current		80
Financing Receivable, after Allowance for Credit Loss		1,300
Financing Receivable, after Allowance for Credit Loss, Noncurrent		$ 1,200