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Stockholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2017			$ 20,501
Reclassifications to retained earnings as a result of the adoption of new accounting standards					$ 190
Net current period other comprehensive income (loss)	$ 172	$ (140)	130	$ (158)
Balance at June 30, 2018	21,734		21,734
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2017			85
Reclassifications to retained earnings as a result of the adoption of new accounting standards					0
Balance at January 1, 2018					85
Net unrealized gain (loss)			(18)
Reclassifications to net income			0
Net current period other comprehensive income (loss)			(18)
Balance at June 30, 2018	67		67
Unrealized Gains and Losses on Available-for-Sale Securities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2017			194
Reclassifications to retained earnings as a result of the adoption of new accounting standards					(293)
Balance at January 1, 2018					(99)
Net unrealized gain (loss)			(6)
Reclassifications to net income			4
Net current period other comprehensive income (loss)			(2)
Balance at June 30, 2018	(101)		(101)
Unrealized Gains and Losses on Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2017			(114)
Reclassifications to retained earnings as a result of the adoption of new accounting standards					0
Balance at January 1, 2018					(114)
Net unrealized gain (loss)			57
Reclassifications to net income			93
Net current period other comprehensive income (loss)			150
Balance at June 30, 2018	36		36
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at December 31, 2017			165
Reclassifications to retained earnings as a result of the adoption of new accounting standards					(293)
Balance at January 1, 2018					$ (128)
Net unrealized gain (loss)			33
Reclassifications to net income			97
Net current period other comprehensive income (loss)			130
Balance at June 30, 2018	$ 2		$ 2

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Amount of stockholders' equity including the portion attributable to noncontrolling interests, after the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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