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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Balance, beginning at Dec. 31, 2019 $ 16,367 $ 132 $ 8,222 $ 8,788 $ (147) $ (862) $ 87
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) (292)     (284)     (8)
Other comprehensive income (loss), net of tax 828         828  
Compensation—restricted stock units (22)   (18) (4)      
Other 3   0 3   0 0
Net change 370   (18) (432)   828 (8)
Balance, ending at Jun. 30, 2020 16,737 132 8,204 8,356   (34) 79
Balance, beginning at Mar. 31, 2020 16,532 132 8,239 8,339   (262) 84
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 18     22     (4)
Other comprehensive income (loss), net of tax 228         228  
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition     (36) (4)      
Compensation—restricted stock units (40)            
Other (1) 0 1 (1)   0 (1)
Net change 205   (35) 17   228 (5)
Balance, ending at Jun. 30, 2020 16,737 132 8,204 8,356   (34) 79
Balance, beginning at Dec. 31, 2020 17,279 132 8,242 8,802   13 90
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 684     690     (6)
Other comprehensive income (loss), net of tax (326)         (326)  
APIC, Share-based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition     (47) (4)      
Compensation—restricted stock units (51)            
Other 4 0 0 0   0 4
Net change 311   (47) 686   (326) (2)
Balance, ending at Jun. 30, 2021 17,590 132 8,195 9,488   (313) 88
Balance, beginning at Mar. 31, 2021 17,159 132 8,264 9,181   (509) 91
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 308     311     (3)
Other comprehensive income (loss), net of tax 196         196  
Compensation—restricted stock units (73)   (69) (4)      
Other 0   0 0     0
Net change 431   (69) 307   196 (3)
Balance, ending at Jun. 30, 2021 $ 17,590 $ 132 $ 8,195 $ 9,488   $ (313) $ 88