Income Taxes (Summary of Tax Credit Carryforwards) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Tax Credit Carryforward [Line Items]
Tax Effected	$ 927
U.S. tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	51
Tax Effected	18
Foreign tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	510
General business credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	115
Minimum tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	101
State tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	1,174
Tax Effected	34
State tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	26
Japan tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	98
Tax Effected	30
Germany tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	53
Tax Effected	15
United Kingdom tax losses
Tax Credit Carryforward [Line Items]
Gross Tax Loss	84
Tax Effected	14
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	0
Tax Effected	26
Spain tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	23
Other subsidiaries tax credits
Tax Credit Carryforward [Line Items]
Gross Tax Loss	0
Tax Effected	$ 8