Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent					0.06	0.90
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 0			$ 0
Undistributed Earnings of Foreign Subsidiaries	4,000,000,000			$ 4,000,000,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent				12.00%	9.00%	0.00%
Effective tax rate				35.00%	35.00%	128.00%
Increase (decrease) in valuation allowance				$ (44,000,000)	$ (120,000,000)
Valuation allowance	(824,000,000)	$ (868,000,000)		(824,000,000)	(868,000,000)
Income tax expense				$ (352,000,000)	$ (708,000,000)	$ (990,000,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	21.00%	35.00%
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share)				$ 0.02	$ 0.04	$ 0.03
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued:
Interest on income taxes accrued	2,000,000	4,000,000		$ 2,000,000	$ 4,000,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0	0		0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense:
Unrecognized Tax Benefits, Income Tax Penalties Expense				0	0	$ 0
Uncertain Tax Positions Additional Disclosures:
Unrecognized tax benefits	465,000,000	463,000,000		465,000,000	463,000,000	348,000,000	$ 352,000,000
Unrecognized tax benefits that would impact effective tax rate	448,000,000	446,000,000		448,000,000	446,000,000	332,000,000
Unrecognized tax benefits that would impact effective tax rate portion with attributes warranting full valuation allowance	33,000,000	33,000,000		33,000,000	33,000,000	29,000,000
Unrecognized Tax benefits Anticipated To Result In Ne Decrease of Unrecognized Tax Benefits WIthin 12 Months of Balance Sheet Date Minimum	0			0
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, maximum	10,000,000			10,000,000
Federal
Income Tax Disclosures [Line Items]
Operating loss carryforwards	800,000,000			800,000,000
State and Local Jurisdiction
Income Tax Disclosures [Line Items]
Operating loss carryforwards	6,900,000,000			6,900,000,000
Foreign Tax Authority
Income Tax Disclosures [Line Items]
Operating loss carryforwards	2,700,000,000			2,700,000,000
General Business Tax Credit Carryforward
Income Tax Disclosures [Line Items]
Tax credit carryforward	23,000,000			23,000,000
Investment Tax Credit Carryforward [Member]
Income Tax Disclosures [Line Items]
Tax credit carryforward	8,000,000			8,000,000
Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward	14,000,000			14,000,000
2021 Expiration | Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward	12,000,000			12,000,000
Non-US [Member]
Income Tax Disclosures [Line Items]
Income tax expense				(26,000,000)	(35,000,000)	(26,000,000)
VIET NAM
Income Tax Disclosures [Line Items]
Income tax expense				$ (13,000,000)	$ (19,000,000)	$ (13,000,000)
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share)				$ 0.01	$ 0.01	$ 0.01
Guacolda Affiliate [Member]
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent				(1.00%)
UNITED STATES
Income Tax Disclosures [Line Items]
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense				$ 124,000,000
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent					0.09	0.88
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent						5.00%
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)		161,000,000	$ 33,000,000		$ 194,000,000
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Liability, Income Tax Benefit				852,000,000	869,000,000
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense				(7,000,000)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount					38,000,000
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	31,000,000			$ 31,000,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)		$ 77,000,000		$ 17,000,000	$ 77,000,000
Uncertain Tax Positions Additional Disclosures:
Unrecognized tax benefits that would impact effective tax rate	161,000,000			$ 161,000,000
ARGENTINA
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent						3.00%
Effective tax rate					35.00%
Income tax expense	$ (4,000,000)				$ (21,000,000)
ARGENTINA | FY 2018 - 2019 [Member]
Income Tax Disclosures [Line Items]
Effective tax rate					30.00%
ARGENTINA | FY 2020 and beyond [Member]
Income Tax Disclosures [Line Items]
Effective tax rate					25.00%
ARGENTINA | FY 2020-2021 [Domain]
Income Tax Disclosures [Line Items]
Effective tax rate				30.00%
ARGENTINA | FY 2022 and beyond [Domain]
Income Tax Disclosures [Line Items]
Effective tax rate				25.00%