Other Assets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred Tax Assets, Net	$ 55	$ 59
Notes, Loans and Financing Receivable, Gross, Current	104		$ 59
Advance Royalties, Noncurrent	6	13
Recoverable Taxes	68	64
Joint venture receivables	52	41
Contractual engineering cost recoveries, current	32	29
Prepaid assets and deposits	19	22
Royalty Agreements, Current	11	17
Nontrade Receivables, Current	11	16
Other Assets, Miscellaneous, Current	0	4
Other Assets, Current	193	193
Contractual engineering cost recoveries, non-current	30	24
Recoverable taxes, non current	19	28
Royalty Agreements, Noncurrent	8
Financial Instruments, Owned, Derivatives and Other Contractual Agreements, at Fair Value		11
Notes Receivable, Related Parties, Noncurrent	6	8
Other	15	20
Other Assets, Noncurrent	133	150
Recoverable Taxes	68	64
Prepaid assets and deposits	19	22
Joint venture receivables	52	41
Nontrade Receivables, Current	11	16
Royalty Agreements, Current	11	17
Contractual engineering cost recoveries, current	32	29
Other Assets, Miscellaneous, Current	0	4
Other Assets, Current	193	193
Recoverable taxes, non current	19	28
Royalty Agreements, Noncurrent	8
Contractual engineering cost recoveries, non-current	30	24
Notes Receivable, Related Parties, Noncurrent	6	8
Financial Instruments, Owned, Derivatives and Other Contractual Agreements, at Fair Value		11
Other	15	20
Other Assets, Noncurrent	133	$ 150
Reimbursement of Engineering costs in current year	12
Reimbursement of Engineering costs in following year	24
Reimbursement for engineering costs expected in year two	8
Reimbursement for engineering costs expected in year three	7
Reimbursement for engineering costs expected in year four	$ 11