Segment Information (Tables)	12 Months Ended
	Dec. 31, 2021
Segment Information [Abstract]
Reconciliation Of Revenue From Segments To Consolidated	For the Years Ended December 31, 2021 2020 2019 Revenues Operating revenues: Annuities$ 4,566 $ 4,067 $ 4,240 Retirement Plan Services 1,308 1,197 1,186 Life Insurance 7,692 7,086 6,999 Group Protection 4,995 4,792 4,587 Other Operations 157 166 199 Excluded realized gain (loss), pre-tax (117) (742) (1,019)Total revenues$ 18,601 $ 16,566 $ 16,192
Reconciliation Of Income (Loss) From Operations By Segment To Consolidated Net Income (Loss)	For the Years Ended December 31, 2021 2020 2019 Net Income (Loss) Income (loss) from operations: Annuities$ 1,326 $ 1,125 $ 987 Retirement Plan Services 223 157 162 Life Insurance 540 (12) 267 Group Protection (128) 42 237 Other Operations (243) (161) (148)Excluded realized gain (loss), after-tax (93) (586) (804)Benefit ratio unlocking, after-tax 15 4 - Net impact from the Tax Cuts and Jobs Act - 37 16 Transaction and integration costs related to mergers, acquisitions and divestitures, after-tax (11) (15) (103)Net income (loss)$ 1,629 $ 591 $ 614
Reconciliation of Net Investment Income From Segments to Consolidated	For the Years Ended December 31, 2021 2020 2019 Net Investment Income Annuities$ 1,316 $ 1,192 $ 1,070 Retirement Plan Services 983 924 917 Life Insurance 3,056 2,689 2,494 Group Protection 365 329 306 Other Operations 124 130 175 Total net investment income$ 5,844 $ 5,264 $ 4,962
Reconciliation of DAC VOBA Amortization From Segments to Consolidated	For the Years Ended December 31, 2021 2020 2019 Amortization of DAC and VOBA, Net of Interest Annuities$ 436 $ 376 $ 427 Retirement Plan Services 31 28 25 Life Insurance 1,029 768 757 Group Protection 107 114 111 Total amortization of DAC and VOBA, net of interest$ 1,603 $ 1,286 $ 1,320
Reconciliation of Federal Income Tax Expense (Benefit) From Segments to Consolidated	For the Years Ended December 31, 2021 2020 2019 Federal Income Tax Expense (Benefit) Annuities$ 251 $ 187 $ 148 Retirement Plan Services 47 21 21 Life Insurance 123 (28) 50 Group Protection (33) 11 63 Other Operations (70) (51) (61)Excluded realized gain (loss) (25) (155) (215)Benefit ratio unlocking 4 1 - Net impact from the Tax Cuts and Jobs Act - (37) (16)Transaction and integration costs related to mergers, acquisitions and divestitures (4) (5) (27)Total federal income tax expense (benefit)$ 293 $ (56)$ (37)
Reconciliation of Assets From Segments to Consolidated Balance Sheet	As of December 31, 2021 2020 Assets Annuities$ 200,827 $ 183,721 Retirement Plan Services 47,633 45,379 Life Insurance 106,973 102,806 Group Protection 10,522 10,201 Other Operations 26,060 26,212 Total assets$ 392,015 $ 368,319