Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Income Tax [Line Items]
Income tax rate	36.70%		35.40%
Increase in income tax percentage	3.5		0.8
Reversal of foreign tax credits			$ 41,000,000
Unrecognized tax benefits	$ 184,000,000		184,000,000	$ 158,000,000
Unrecognized tax benefits that would impact the effective tax rate	82,000,000		82,000,000	76,000,000
Unrecognized tax benefits that would impact deferred taxes	102,000,000		102,000,000	82,000,000
Possible decrease in unrecognized tax benefits	$ 140,000,000		140,000,000
Tax Year 2007 Through Tax Year 2009 [Member]
Income Tax [Line Items]
Reversal of tax reserves			$ (59,000,000)
PMI [Member]
Income Tax [Line Items]
Unrecognized tax benefits				$ 0
PMI [Member] | Tax Year 2007 Through Tax Year 2009 [Member]
Income Tax [Line Items]
Net tax benefits		$ (41,000,000)