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AOCI - Activity of the Components of Other Comprehensive Income and AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2018
Net activity for accumulated net unrealized gain (loss) on available-for-sale debt securities            
Unrealized holding gains (losses) on available-for-sale debt securities arising during period $ 379 $ (207)   $ 1,387 $ (834)  
Reclassification adjustment for net (gains) losses included in net income (2) 0   (2) 7  
Net activity for net unrealized gain (loss) on cash flow hedge derivatives            
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period 83 (19)   361 (24)  
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income (4) 2   (2) 2  
Net activity for defined benefit plans, net            
Net actuarial gain (loss) arising during the period 0 2   0 2  
Reclassification of amounts to net periodic benefit costs (1) (3)   (3) (5)  
Total Other Comprehensive Activity            
Pre-tax activity total 595 (293)   2,272 (1,097)  
Total, Tax (138) 70   (525) 251  
Other comprehensive income (loss) 457 (223) $ 1,747 1,747 (846) $ (846)
Total Accumulated Other Comprehensive Income            
Total Accumulated Other Comprehensive Income - Beginning Balance 1,178 (552)   (112) 71  
Other comprehensive income (loss), Net of Tax 457 (223) 1,747 1,747 (846) (846)
Total Accumulated Other Comprehensive Income - Ending Balance 1,635 (775) 1,635 1,635 (775) (775)
Accumulated Net Unrealized Investment Gain (Loss)            
Pre-tax activity for accumulated net unrealized gain (loss) on available-for-sale debt securities            
Unrealized holding gains (losses) on available-for-sale debt securities arising during period 497 (271)   1,817 (1,082)  
Reclassification adjustment for net losses (gains) included in net income (3) 0   3 9  
Net unrealized gains on available-for-sale debt securities 494 (271)   1,814 (1,073)  
Tax effect for accumulated net unrealized gain (loss) on available-for-sale debt securities            
Unrealized holding gains (losses) on available-for-sale debt securities arising during period (118) 64   (430) 248  
Reclassification adjustment for net losses (gains) included in net income (1) 0   (1) (2)  
Net unrealized gains on available-for-sale debt securities (117) 64   (429) 246  
Net activity for accumulated net unrealized gain (loss) on available-for-sale debt securities            
Unrealized holding gains (losses) on available-for-sale debt securities arising during period 379 (207)   1,387 (834)  
Reclassification adjustment for net (gains) losses included in net income (2) 0   (2) 7  
Net unrealized gains on available-for-sale debt securities 377 (207)   1,385 (827)  
Total Other Comprehensive Activity            
Other comprehensive income (loss) 377 (207)   1,385 (827)  
Total Accumulated Other Comprehensive Income            
Total Accumulated Other Comprehensive Income - Beginning Balance 781 (485)   (227) 135  
Other comprehensive income (loss), Net of Tax 377 (207)   1,385 (827)  
Total Accumulated Other Comprehensive Income - Ending Balance 1,158 (692) 1,158 1,158 (692) (692)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges            
Pre-tax activity for net unrealized gain (loss) on cash flow hedge derivatives            
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period 105 (25)   456 (31)  
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income (5) 2   (2) 2  
Net unrealized gains on cash flow hedge derivatives 100 (23)   454 (29)  
Tax effect for net unrealized gain (loss) on cash flow hedge derivatives            
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period (22) 6   (95) 7  
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income 1 0   0 0  
Net unrealized gains on cash flow hedge derivatives (21) 6   (95) 7  
Net activity for net unrealized gain (loss) on cash flow hedge derivatives            
Unrealized holding gains (losses) on cash flow hedge derivatives arising during period 83 (19)   361 (24)  
Reclassification adjustment for net gains on cash flow hedge derivatives included in net income (4) 2   (2) 2  
Net unrealized gains on cash flow hedge derivatives 79 (17)   359 (22)  
Total Other Comprehensive Activity            
Other comprehensive income (loss) 79 (17)   359 (22)  
Total Accumulated Other Comprehensive Income            
Total Accumulated Other Comprehensive Income - Beginning Balance 440 (16)   160 (11)  
Other comprehensive income (loss), Net of Tax 79 (17)   359 (22)  
Total Accumulated Other Comprehensive Income - Ending Balance 519 (33) 519 519 (33) (33)
Amortization Of Defined Benefit Pension Items            
Pre-tax activity for defined benefit plans, net            
Net actuarial loss   2     2  
Reclassification of amounts to net periodic benefit costs 1 3   4 7  
Defined benefit plans, net 1 1   4 5  
Tax effect for defined benefit plans, net            
Net actuarial loss   0     0  
Reclassification of amounts to net periodic benefit costs 0 0   (1) (2)  
Defined benefit plans, net 0 0   (1) (2)  
Net activity for defined benefit plans, net            
Net actuarial gain (loss) arising during the period   2     2  
Reclassification of amounts to net periodic benefit costs (1) 3   3 (5)  
Defined benefit plans, net 1 1   3 3  
Total Other Comprehensive Activity            
Other comprehensive income (loss) 1 (1)   3 3  
Total Accumulated Other Comprehensive Income            
Total Accumulated Other Comprehensive Income - Beginning Balance (43) (51)   (45) (53)  
Other comprehensive income (loss), Net of Tax 1 (1)   3 3  
Total Accumulated Other Comprehensive Income - Ending Balance $ (42) $ (50) $ (42) $ (42) $ (50) $ (50)