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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 5,359 $ 3,137
Other comprehensive income (loss) before reclassifications (2,108) 1,510
Amounts reclassified to (from) AOCI (175) (9)
Deferred income tax benefit (expense) 507 (349)
Accumulated Other Comprehensive Income (Loss), Net of Tax 3,583 4,289
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax (69) (92)
Other comprehensive income (loss) before reclassifications 33 (82)
Amounts reclassified to (from) AOCI 0 0
Deferred income tax benefit (expense) 14 (3)
Accumulated Other Comprehensive Income (Loss), Net of Tax (50) (171)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax [1] 5,500 3,299
Other comprehensive income (loss) before reclassifications [1] (2,136) 1,610
Amounts reclassified to (from) AOCI [1] (181) (12)
Deferred income tax benefit (expense) [1] 521 (355)
Accumulated Other Comprehensive Income (Loss), Net of Tax [1] 3,704 4,542
Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss), Net of Tax (72) (70)
Other comprehensive income (loss) before reclassifications (5) (18)
Amounts reclassified to (from) AOCI 6 3
Deferred income tax benefit (expense) 0 3
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (71) $ (82)
[1] Includes cash flow hedges of $(55) and $(49) as of September 30, 2021 and December 31, 2020, respectively, and $(57) and $(26) as of September 30, 2020 and December 31, 2019, respectively. See Note 5 – “Derivative Instruments” for additional information on cash flow hedges.