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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 45,344 $ 41,035 $ 13,711
Other comprehensive income (loss), net of tax 72 765 (405)
Less: Net translation gain (loss) on foreign currencies attributable to noncontrolling interests (8) (5) (15)
Shareholders other comprehensive income (loss), net of tax 80 770 (390)
Balance 50,328 45,344 41,035
Adjustment upon Adoption      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (30) [1] (15) 58
Balance   (30) [1] (15)
Securities and Derivatives      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 975 18 328
Other comprehensive income (loss) before reclassifications, before tax 776 1,266 (512)
Other comprehensive income (loss) before reclassifications, tax (150) (270) 100
Other comprehensive income (loss) before reclassifications, after-tax 626 996 (412)
Reclassification adjustment, tax 187 10 (13)
Net amounts reclassified from AOCI to net income (701) (39) 47
Shareholders other comprehensive income (loss), net of tax (75) 957 (365)
Balance 900 975 18
Securities and Derivatives | Adjustment upon Adoption | Reclassification adjustment to retained earnings related to U.S. tax reform legislation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     65
Securities and Derivatives | Adjustment upon Adoption | Reclassification adjustment to retained earnings related to new financial instruments guidance      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (4)
Securities and Derivatives | Adjustment upon Adoption | Reclassification adjustment from retained earnings related to new hedging guidance      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (6)
Securities and Derivatives | Adjusted Balance      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     383
Reclassification adjustment for (gains) included in shareholders' net income ((gain) loss on sale of business)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification adjustment, before tax (862) 0 0
Reclassification adjustment for (gains) losses included in shareholders' net income (net realized investment (gains) losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification adjustment, before tax (26) (49) 60
Translation of foreign currencies      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications, before tax, including temporary equity 232 (57) (167)
Other comprehensive income (loss) before reclassifications, tax, including temporary equity 12 (2) 0
Other comprehensive income (loss) before reclassifications, after-tax, including temporary equity 244 (59) (167)
Reclassification adjustment, before tax 11 0 0
Reclassification adjustment, tax (3) 0 0
Net amounts reclassified from AOCI to net income 8 0 0
Other comprehensive income (loss), net of tax 252 (59) (167)
Translation of foreign currencies attributable to noncontrolling interest      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Less: Net translation gain (loss) on foreign currencies attributable to noncontrolling interests (8) (5) (15)
Translation of foreign currencies attributable to parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (275) (221) (65)
Shareholders other comprehensive income (loss), net of tax 260 (54) (152)
Balance (15) (275) (221)
Translation of foreign currencies attributable to parent | Adjustment upon Adoption | Reclassification adjustment to retained earnings related to U.S. tax reform legislation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (4)
Translation of foreign currencies attributable to parent | Adjusted Balance      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (69)
Postretirement benefits liability      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (1,641) (1,508) (1,345)
Other comprehensive income (loss) before reclassifications, before tax (206) (249) 93
Other comprehensive income (loss) before reclassifications, tax 48 59 (20)
Other comprehensive income (loss) before reclassifications, after-tax (158) (190) 73
Reclassification adjustment, tax (17) (15) (15)
Net amounts reclassified from AOCI to net income 53 57 54
Shareholders other comprehensive income (loss), net of tax (105) (133) 127
Balance (1,746) (1,641) (1,508)
Postretirement benefits liability | Adjustment upon Adoption | Reclassification adjustment to retained earnings related to U.S. tax reform legislation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (290)
Postretirement benefits liability | Adjusted Balance      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance     (1,635)
Reclassification adjustment for amortization of net prior actuarial losses and prior service costs (interest expense and other)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification adjustment, before tax 70 62 69
Reclassification adjustment for settlement (interest expense and other)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification adjustment, before tax $ 0 $ 10 $ 0
[1] See Note 3 for further information about the Company's adoption of new credit loss guidance (ASU 2016-13).