Marketable Securities (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	$ 2	$ 4
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(38)	(6)
Available-for-sale Securities, Amortized Cost Basis	1,002	879
Available-for-sale Securities	966	877
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	0	4
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	(38)	(6)
Available-for-sale Equity Securities, Amortized Cost Basis	309	296
Available-for-sale Securities, Equity Securities	271	294
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	297	256
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	297	256
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	228	182
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	228	182
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	99	116
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	1	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	0
Available-for-sale Securities, Debt Securities	100	116
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	69	26
Available-for-sale Securities, Gross Unrealized Gain, Accumulated in Investments	1	0
Available-for-sale Securities, Gross Unrealized Loss, Accumulated in Investments	0	0
Available-for-sale Securities, Debt Securities	70	26
Long-term marketable securities [Member] \| Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	0	3
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	$ 0	$ 3

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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