Quarterly report pursuant to Section 13 or 15(d)

Short-Term And Long-Term Investments And Restricted Deposits (Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits) (Details)

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Short-Term And Long-Term Investments And Restricted Deposits (Contractual Maturities Of Short-Term And Long-Term Investments And Restricted Deposits) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost $ 140 $ 176
One year through five years, Amortized Cost 1,325 1,121
Five years through ten years, Amortized Cost 135 121
Greater than ten years, Amortized Cost 80 38
Total, Amortized Cost 1,680 1,456
One year or less, Fair Value 140 177
One year through five years, Fair Value 1,326 1,121
Five years through ten years, Fair Value 135 120
Greater than ten years, Fair Value 80 39
Total, Fair Value 1,681 1,457
Restricted Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
One year or less, Amortized Cost 99 92
One year through five years, Amortized Cost 2 8
Five years through ten years, Amortized Cost 0 0
Greater than ten years, Amortized Cost 0 0
Total, Amortized Cost 101 100
One year or less, Fair Value 99 92
One year through five years, Fair Value 2 8
Five years through ten years, Fair Value 0 0
Greater than ten years, Fair Value 0 0
Total, Fair Value $ 101 $ 100