Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	[1]		$ 50
Royalty Expense		$ 24	26	$ 25
Guarantor Obligations, Current Carrying Value		0
Unrecorded Unconditional Purchase Obligation
Operating Leases, Future Minimum Payments, Due in Two Years	[1]		19
Operating Leases, Future Minimum Payments, Due in Three Years	[1]		20
Operating Leases, Future Minimum Payments, Due in Four Years	[1]		18
Operating Leases, Future Minimum Payments, Due in Five Years	[1]		17
Operating Leases, Future Minimum Payments, Due Thereafter	[1]		192
Operating Leases, Future Minimum Payments Due	[1]		$ 316
LTSA [Member]
Unrecorded Unconditional Purchase Obligation
Unrecorded Unconditional Purchase Obligation		$ 217
Minimum [Member] | LTSA [Member]
Unrecorded Unconditional Purchase Obligation
Unrecorded Unconditional Purchase Obligation, Term		1 year
Maximum [Member] | LTSA [Member]
Unrecorded Unconditional Purchase Obligation
Unrecorded Unconditional Purchase Obligation, Term		20 years

[1] During the years ended December 31, 2018 and 2017, expense for operating leases amounted to $53 million and $50 million, respectively.