Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosures [Line Items]
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent		6.00%	90.00%	12.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability		(2.00%)	10.00%	10.00%
Effective Income Tax Rate Reconciliation Withholding Tax Reversals		0.00%	0.00%	31.00%
Deferred Tax Liabilities, Undistributed Foreign Earnings		$ 0
Undistributed Earnings of Foreign Subsidiaries		$ 4,000,000,000
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent		9.00%	0.00%	(46.00%)
Effective tax rate		35.00%	128.00%	17.00%
Increase (decrease) in valuation allowance		$ (120,000,000)	$ 112,000,000
Valuation allowance		(868,000,000)	(988,000,000)
Income tax expense		$ (708,000,000)	$ (990,000,000)	$ (32,000,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	35.00%	35.00%
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share)		$ 0.04	$ 0.03	$ 0.02
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued:
Interest on income taxes accrued		$ 4,000,000	$ 7,000,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued		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		463,000,000	348,000,000	352,000,000	$ 364,000,000
Unrecognized tax benefits that would impact effective tax rate		446,000,000	332,000,000	332,000,000
Unrecognized tax benefits that would impact effective tax rate portion with attributes warranting full valuation allowance		33,000,000	29,000,000	24,000,000
Unrecognized Tax benefits Anticipated To Result In Ne Decrease of Unrecognized Tax Benefits WIthin 12 Months of Balance Sheet Date Minimum		0
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, maximum		10,000,000
Federal
Income Tax Disclosures [Line Items]
Operating loss carryforwards		1,100,000,000
State and Local Jurisdiction
Income Tax Disclosures [Line Items]
Operating loss carryforwards		8,500,000,000
Foreign Tax Authority
Income Tax Disclosures [Line Items]
Operating loss carryforwards		2,400,000,000
General Business Tax Credit Carryforward
Income Tax Disclosures [Line Items]
Tax credit carryforward		22,000,000
Federal Alternative Minimum Tax
Income Tax Disclosures [Line Items]
Tax credit carryforward		15,000,000
Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward		14,000,000
2021 Expiration | Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward		13,000,000
Year 2023 to 2028 [Member] | Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward		1,000,000
Non-US [Member]
Income Tax Disclosures [Line Items]
Income tax expense		(35,000,000)	(26,000,000)	(20,000,000)
VIET NAM
Income Tax Disclosures [Line Items]
Income tax expense		$ (19,000,000)	$ (13,000,000)	$ (15,000,000)
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
Chilean tax reform Member [Member]
Income Tax Disclosures [Line Items]
Effective tax rate	25.00%	27.00%	25.50%
Other Tax Expense (Benefit)	$ 26,000,000