Income Taxes (Net Operating Loss Carryforwards and Tax Credit Carryforwards Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	$ 224
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	$ 28
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	28
Valuation allowance offset for State net operating loss carryforwards due to uncertain recoverability	22
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	2,000
CHINA
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 140
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