Marketable Securities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	$ 0	$ 0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	(1)
Available-for-sale Securities, Amortized Cost Basis	468	484
Available-for-sale Securities	468	483
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments		0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments		0
Available-for-sale Equity Securities, Amortized Cost Basis		1
Available-for-sale Securities, Equity Securities		1
Short-term marketable securities [Member] \| United States Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	259	287
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	0	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	0
Available-for-sale Securities, Debt Securities	259	287
Short-term marketable securities [Member] \| Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	2	1
Available-for-sale Securities, Debt Securities	2	1
Short-term marketable securities [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		8
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments		0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments		0
Available-for-sale Securities, Debt Securities		8
Long-term marketable securities [Member] \| United States Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	117	121
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	0	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	(1)
Available-for-sale Securities, Debt Securities	117	120
Long-term marketable securities [Member] \| Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	90	66
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	0	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	0
Available-for-sale Securities, Debt Securities	$ 90	$ 66

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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