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Consolidated Statements Of Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Common shares in treasury [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Cumulative Foreign Currency Translation Adjustment [Member]
Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance - beginning of period at Dec. 31, 2019   $ 11,121 $ (3,754) $ 11,203 $ 36,142 $ (72) $ 36,070 $ 2,543 $ (1,939) $ 15  
Common Shares repurchased     (326)                
Net shares redeemed under employee share-based compensation plans     214 (189)              
Exercise of stock options       (29)              
Share-based compensation expense       124              
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings       (693)              
Net income (loss) $ (79)       (79)            
Funding of dividends declared from Additional paid-in capital         693            
Dividends declared on Common Shares         (693)            
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198)               571      
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42)               310      
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240)               881      
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40                 (374)    
Change in period, net of income tax benefit of $2, $5, $7 and $8                   (28)  
Balance - end of period at Jun. 30, 2020 54,760 11,121 (3,866) 10,416 35,991     3,424 (2,313) (13) $ 1,098
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (42)             (42)      
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax               (240)      
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax               (198)      
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax                 40    
Pension liability adjustment, Change in period, income tax (expense) benefit                   8  
Balance - beginning of period at Mar. 31, 2020   11,121 (3,872) 10,710 36,322 0 36,322 667 (2,764) 4  
Common Shares repurchased     0                
Net shares redeemed under employee share-based compensation plans     6 7              
Exercise of stock options       (3)              
Share-based compensation expense       55              
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings       (353)              
Net income (loss) (331)       (331)            
Funding of dividends declared from Additional paid-in capital         353            
Dividends declared on Common Shares         (353)            
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198)               2,726      
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42)               31      
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240)               2,757      
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40                 451    
Change in period, net of income tax benefit of $2, $5, $7 and $8                   (17)  
Balance - end of period at Jun. 30, 2020 54,760 11,121 (3,866) 10,416 35,991     3,424 (2,313) (13) 1,098
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax (2)             (2)      
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax               (524)      
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax               (522)      
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax                 6    
Pension liability adjustment, Change in period, income tax (expense) benefit                   5  
Balance - beginning of period at Dec. 31, 2020 59,441 11,064 (3,644) 9,815 39,337 0 39,337 4,673 (1,637) (167)  
Common Shares repurchased     (2,440)                
Net shares redeemed under employee share-based compensation plans     312 (182)              
Exercise of stock options       (30)              
Share-based compensation expense       147              
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings       (704)              
Net income (loss) 4,565       4,565            
Funding of dividends declared from Additional paid-in capital         704            
Dividends declared on Common Shares         (704)            
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198)               (1,293)      
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42)               (38)      
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240)               (1,331)      
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40                 314    
Change in period, net of income tax benefit of $2, $5, $7 and $8                   (30)  
Balance - end of period at Jun. 30, 2021 60,062 11,064 (5,772) 9,046 43,902     3,342 (1,323) (197) 1,822
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax $ (2)             (2)      
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax               292      
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax               294      
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax                 (16)    
Pension liability adjustment, Change in period, income tax (expense) benefit                   7  
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13 [Member]                    
Balance - beginning of period at Mar. 31, 2021   11,064 (3,901) 9,318 41,637 $ 0 $ 41,637 2,761 (1,613) (190)  
Common Shares repurchased     (1,921)                
Net shares redeemed under employee share-based compensation plans     50 5              
Exercise of stock options       (6)              
Share-based compensation expense       81              
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings       (352)              
Net income (loss) $ 2,265       2,265            
Funding of dividends declared from Additional paid-in capital         352            
Dividends declared on Common Shares         (352)            
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(107), $(522), $294 and $(198)               599      
Amounts reclassified from AOCI, net of income tax expense of $(6), $(2), $(2), $(42)               (18)      
Change in period, net of income tax (expense) benefit of $(113), $(524), $292 and $(240)               581      
Change in period, net of income tax (expense) benefit of $(18), $6, $(16) and $40                 290    
Change in period, net of income tax benefit of $2, $5, $7 and $8                   (7)  
Balance - end of period at Jun. 30, 2021 60,062 $ 11,064 $ (5,772) $ 9,046 $ 43,902     3,342 (1,323) (197) $ 1,822
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax $ (6)             (6)      
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax               (113)      
OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, Tax               $ (107)      
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax                 $ (18)    
Pension liability adjustment, Change in period, income tax (expense) benefit                   $ 2