Income Taxes (Summary of Tax Credit Carryforwards) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Tax Credit Carryforward [Line Items]
Tax Effected	$ 1,028
U.S. tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	66
Tax Effected	23
Foreign tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	584
General business credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	133
Minimum tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	100
State tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	1,221
Tax Effected	33
State tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	28
Japan tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	91
Tax Effected	30
Germany tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	86
Tax Effected	25
United Kingdom tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	95
Tax Effected	17
Singapore tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	40
Tax Effected	7
Other subsidiaries tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	47
Tax Effected	12
Spain tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	24
Other subsidiaries tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	$ 12