Annual report pursuant to Section 13 and 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Contractual Maturities (Details)

v3.8.0.1
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Contractual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Amortized Cost:    
Amortized cost, under 1 year $ 111 $ 224
Amortized cost, 1-5 years 1,333 1,147
Amortized cost, 6-10 years 2,088 1,957
Amortized cost, over 10 years 11,595 11,885
Amortized cost 15,727 15,777
Fair Value:    
Fair value, under 1 year 111 222
Amortized cost, 1-5 years 1,327 1,150
Fair value, 6-10 years 2,083 1,962
Amortized cost, over 10 years 11,348 11,665
Fair Value 15,469 15,563
Nonmarketable equity securities    
Amortized Cost:    
Amortized cost 581 548
Fair Value:    
Fair Value 581 548
Mutual Fund [Member]    
Amortized Cost:    
Amortized cost 18 15
Fair Value:    
Fair Value 18 15
Equity Securities [Member]    
Amortized Cost:    
Amortized cost 1 1
Fair Value:    
Fair Value $ 1 $ 1