Commitments and Contingencies - Future Minimum Commitments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Long-term Purchase Commitment [Line Items]
Unrecognized tax benefits, net of tax credits - Current		$ 455
Unrecognized tax benefits, net of tax credits, Non-current		495
Amount expected to pay for Transition Tax		467
Scenario, Forecast
Long-term Purchase Commitment [Line Items]
Amount expected to pay for Transition Tax during 2018	$ 77
Total Contractual Obligations
Long-term Purchase Commitment [Line Items]
2018		461
2019		231
2020		221
2021		1,838
2022		553
Thereafter		3,152
Total		6,456
Facility and Equipment Leases
Long-term Purchase Commitment [Line Items]
2018		81
2019		70
2020		61
2021		48
2022		41
Thereafter		88
Total		389
Developer and Intellectual Properties
Long-term Purchase Commitment [Line Items]
2018		202
2019		2
2020		1
2021		0
2022		0
Thereafter		0
Total		205
Marketing
Long-term Purchase Commitment [Line Items]
2018		19
2019		0
2020		0
2021		0
2022		0
Thereafter		0
Total		19
Long-term debt obligations
Long-term Purchase Commitment [Line Items]
2018		159
2019		159
2020		159
2021		1,790
2022		512
Thereafter		3,064
Total		$ 5,843