Disputes, Litigation and Contingencies (Details) $ in Millions			3 Months Ended	12 Months Ended
	Sep. 27, 2016	Jul. 31, 2015 patent	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2010 claim
Loss Contingencies [Line Items]
Shareholder derivative actions filed | claim								3
Loss Contingency, Patents Allegedly Infringed, Number | patent		7
Estimated litigation liability					$ 44	$ 29
U.S. SEC and DOJ Investigation [Domain]
Loss Contingencies [Line Items]
Payments for legal settlements			$ 50
Loss Contingency Accrual							$ 140
Loss Contingency, Settlement Agreement, Internal Control Reporting, Tax, Period of Time	2 years
Settlement payments due in 120 days [Domain] | U.S. SEC and DOJ Investigation [Domain]
Loss Contingencies [Line Items]
Payments for legal settlements				$ 90