Fair Value (Available-for-sale Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis, Total	$ 258	$ 54
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	25	12
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(3)	(1)
Available-for-sale Securities	280us-gaap_AvailableForSaleSecurities	65us-gaap_AvailableForSaleSecurities
Government and Corporate [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis, Total	161	23
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(2)	(1)
Available-for-sale Securities, Debt Securities	162	22
Domestic [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis, Total	73	25
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	18	9
Available-for-sale Securities, Equity Securities	91	34
International [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Equity Securities, Amortized Cost Basis, Total	24	6
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	4	3
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax	(1)
Available-for-sale Securities, Equity Securities	$ 27	$ 9

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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