Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosures [Line Items]
Effective tax rate	41.00%	27.00%	33.00%
Increase (decrease) in valuation allowance	$ (103)	$ (93)
Valuation allowance	894	997
Tax benefits related to tax status of operations in countries subject to reduced tax rates	21	38	$ 70
Income tax expense	$ (465)	$ (419)	$ (343)
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	$ 0.09
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued:
Interest on income taxes accrued	$ 8	$ 14
Income tax penalties accrued	0	1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense:
Interest on income taxes expense	0	3	$ (4)
Income tax penalties expense	0	0	(3)
Uncertain Tax Positions Additional Disclosures:
Unrecognized tax benefits	373	395	392	$ 475
Unrecognized tax benefits that would impact effective tax rate	343	366	360
Unrecognized tax benefits that would impact effective tax rate portion with attributes warranting full valuation allowance	24	$ 24	$ 26
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, minimum	15
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, maximum	25
Federal
Income Tax Disclosures [Line Items]
Operating loss carryforwards	3,500
Operating loss carryforwards amount related to stock option deductions to be recognized in APIC	87
State and Local Jurisdiction
Income Tax Disclosures [Line Items]
Operating loss carryforwards	8,400
Foreign Tax Authority
Income Tax Disclosures [Line Items]
Operating loss carryforwards	3,500
General Business Tax Credit Carryforward
Income Tax Disclosures [Line Items]
Tax credit carryforward	18
Federal Alternative Minimum Tax
Income Tax Disclosures [Line Items]
Tax credit carryforward	5
Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward	32
Year 2018 to 2025 | Foreign Jurisdictions
Income Tax Disclosures [Line Items]
Tax credit carryforward	24
No Expiration
Income Tax Disclosures [Line Items]
Tax credit carryforward	8
VIET NAM
Income Tax Disclosures [Line Items]
Income tax expense	$ 8
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share)	$ 0.01
2015 through 2018 [Member] | VIET NAM
Income Tax Disclosures [Line Items]
Effective tax rate	0.00%
2019 through 2027 [Member] [Member] | VIET NAM
Income Tax Disclosures [Line Items]
Effective tax rate	5.00%
2028 and beyond [Member] [Member] | VIET NAM
Income Tax Disclosures [Line Items]
Effective tax rate	10.00%