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Shareholders' Equity (Details - Other Comprehensive Income Activity) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale securities, before tax      
Unrealized gains (losses), before tax $ 213 $ (10) $ (136)
Reclassification into earnings, before tax (39) (53) (39)
Net change from available-for-sale securities, before tax 174 (63) (175)
Cash flow hedging instruments, before tax      
Unrealized gains (losses), before tax 0 0 (17)
Reclassification into earnings, before tax 0 0 439
Net change from cash flow hedging instruments, before tax 0 0 422
Foreign currency translation, before tax      
Unrealized gains (losses), before tax 0 0 (3)
Reclassification into earnings, before tax (2) 0 0
Net change from foreign currency translation, before tax (2) 0 (3)
Available-for-sale securities, tax effect      
Unrealized gains (losses), tax effect (76) 5 52
Reclassification into earnings, tax effect 15 20 15
Net change from available-for-sale securities, tax effect (61) 25 67
Cash flow hedging instruments, tax effect      
Unrealized gains (losses), tax effect 0 0 7
Reclassification into earnings, tax effect 0 0 (168)
Net change from cash flow hedging instruments, tax effect 0 0 (161)
Foreign currency translation, tax effect      
Unrealized gains (losses), tax effect 0 0 0
Reclassification into earnings, tax effect 0 0 0
Net change from foreign currency translation, tax effect 0 0 0
Available-for-sale securities, after tax      
Unrealized gains (losses), after tax 137 (5) (84)
Reclassification into earnings, after tax (24) (33) (24)
Net change from available-for-sale securities 113 (38) (108)
Cash flow hedging instruments, after tax      
Unrealized losses, net 0 0 (10)
Reclassification into earnings, after tax 0 0 271
Net change from cash flow hedging instruments 0 0 261
Foreign currency translation, after tax      
Unrealized gains (losses), after tax 0 0 (3)
Reclassification into earnings, after tax (2) 0 0
Net change from foreign currency translation, after tax (2) 0 (3)
Other comprehensive income (loss), before tax 172 (63) 244
Other comprehensive income (loss), tax effect (61) 25 (94)
Other comprehensive income (loss) $ 111 $ (38) $ 150