Income Taxes (Net Operating Loss Carryforwards and Tax Credit Carryforwards Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 243
Tax Credit Carryforward, Valuation Allowance	207
Alternative Minimum Tax Credit Carryforwards, Before Tax	$ 18
Tax Credit Carryforward, Expiration Date	Dec. 31, 2027
US Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 31
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	35
Valuation allowance offset for State net operating loss carryforwards due to uncertain recoverability	28
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,800
Tax Credit Carryforward, Valuation Allowance		$ 164
CHINA
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 167
Minimum [Member] | US Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward expiration	Dec. 31, 2022
Minimum [Member] | CHINA
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward expiration	Dec. 31, 2020
Maximum [Member] | CHINA
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward expiration	Dec. 31, 2024
Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 8
Tax Credit Carryforward, Expiration Date	Dec. 31, 2037