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Shareholders' Equity (Details - Accumulated Other Comprehensive Loss) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, $ (137) $ (99) $ (249)
Other comprehensive income (loss), before reclassifications 137 (5) (97)
Amounts reclassified from accumulated other comprehensive income (loss) (26) (33) 247
Other comprehensive income (loss) 111 (38) 150
Ending balance, (26) (137) (99)
Available-for-sale securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, (139) (101) 7
Other comprehensive income (loss), before reclassifications 137 (5) (84)
Amounts reclassified from accumulated other comprehensive income (loss) (24) (33) (24)
Other comprehensive income (loss) 113 (38) (108)
Ending balance, (26) (139) (101)
Foreign currency translation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance, 2 2 5
Other comprehensive income (loss), before reclassifications 0 0 (3)
Amounts reclassified from accumulated other comprehensive income (loss) (2) 0 0
Other comprehensive income (loss) (2) 0 (3)
Ending balance, $ 0 2 2
Cash flow hedging instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance,   $ 0 (261)
Other comprehensive income (loss), before reclassifications     (10)
Amounts reclassified from accumulated other comprehensive income (loss)     271
Other comprehensive income (loss)     261
Ending balance,     $ 0