Segment Information - Schedule of Revenue by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers [Line Items]
Revenues	$ 7,320	$ 7,500	$ 7,776	$ 7,794	$ 8,506	$ 8,295	$ 8,244	$ 7,594	$ 30,390	$ 32,639	$ 24,890
United States [Member]
Revenues from External Customers [Line Items]
Revenues									19,354	21,234	18,182
Europe [Member]
Revenues from External Customers [Line Items]
Revenues									6,365	7,528	5,442
JAPAN
Revenues from External Customers [Line Items]
Revenues									2,527	1,935	53
Other Countries [Member]
Revenues from External Customers [Line Items]
Revenues									$ 2,144	$ 1,942	$ 1,213