Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME - Activity/Roll Forward (Details)

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OTHER COMPREHENSIVE INCOME - Activity/Roll Forward (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pretax      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold   $ 4 $ 1
Unrealized gains (losses) on derivatives used in cash flow hedging relationships arising during the period   3 2
Less: Reclassification adjustment for net (gains) losses included in net income   1  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships   4 2
Net change in pension and post-retirement obligations $ (4) 0 (38)
Total other comprehensive income (loss), pretax (106) (52) (269)
Tax (Expense) Benefit      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold   (2) 0
Unrealized gains (losses) on derivatives used in cash flow hedging relationships arising during the period   (1) (1)
Less: Reclassification adjustment for net (gains) losses included in net income   0  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships   (1) (1)
Net change in pension and other post-retirement obligations 0 0 (13)
Total other comprehensive income (loss) 26 18 94
After-tax      
Noncredit-related impairment recoveries (losses) on debt securities not expected to be sold   2 1
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities (84) (39) (202)
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period   2 1
Less: Reclassification adjustment for net losses (gains) losses included in net income   1  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships 0 3 1
Net change in pension and post-retirement obligations 4 0 25
Other comprehensive loss, net of tax (80) (34) (175)
Equity Securities [Member]      
Pretax      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities   1  
Tax (Expense) Benefit      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities   (1)  
After-tax      
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities   0  
Debt securities      
Pretax      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period (151) (87) (203)
Less: Reclassification adjustment for net losses (gains) included in net income 41 26 (107)
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities (110) (57) (309)
Tax (Expense) Benefit      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period 35 31 70
Less: Reclassification adjustment for net losses (gains) included in net income (9) (9) 38
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities 26 20 108
After-tax      
Unrealized holding gains (losses) on available-for-sale debt securities arising during the period (116) (56) (133)
Less: Reclassification adjustment for net gains (losses) included in net income 32 17 (69)
Net change in unrealized holding gains (losses) on available-for-sale debt/equity securities $ (84) $ (37) $ (201)