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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net unrealized derivative instrument (losses) gains arising during the periods, tax $ (38) $ 57 $ 122
Reclassification adjustment for net derivative (gains) losses included in net income, tax (22) (9) 10
Net unrealized securities available for sale (losses) gains arising during the periods, tax (82) (38) 116
Other-than-temporary impairment not recognized in earnings on securities, tax (10) (14) (13)
Reclassification of net securities gains to net income, tax (2) (8) (7)
Actuarial loss, tax (20) (3) (92)
Net prior service credit, tax 0 0 3
Amortization of actuarial loss, tax 6 3 3
Amortization of net prior service credit, tax 0 0 0
Divestitures effective September 1, 2014, tax $ 0 $ 0 $ 12