Income Taxes - Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income (Loss) Before Income Taxes [Line Items]
Total income before income taxes	$ 2,127	$ 2,145	$ 1,761
Ireland [Member]
Income (Loss) Before Income Taxes [Line Items]
Total income before income taxes	(923)	(608)	(332)
Foreign [Member]
Income (Loss) Before Income Taxes [Line Items]
Total income before income taxes	$ 3,050	$ 2,753	$ 2,093