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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) - Fixed Maturities [Member] - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | $ 3,693 | $ 176
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,615 | 171
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 7,308 | 347
Debt Securities, Available-for-sale, Unrealized Loss Position | 44,546 | 13,284
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 31,631 | 10,644
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,915 | 2,640
External Credit Rating, Investment Grade [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 3,598 | 156
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,485 | 104
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 7,083 | 260
Debt Securities, Available-for-sale, Unrealized Loss Position | 43,181 | 12,500
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 30,773 | 10,045
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 12,408 | 2,455
External Credit Rating, Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2,756 | 86
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,225 | 51
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 4,981 | 137
Debt Securities, Available-for-sale, Unrealized Loss Position | 28,707 | 5,081
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 21,867 | 4,135
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6,840 | 946
External Credit Rating, Investment Grade [Member] | Canadian Provincial Governments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 42 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 23 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 65 | 1
Debt Securities, Available-for-sale, Unrealized Loss Position | 625 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 554 | 20
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 71 | 0
External Credit Rating, Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 62 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 53 | 4
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 115 | 7
Debt Securities, Available-for-sale, Unrealized Loss Position | 845 | 234
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 664 | 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 181 | 102
External Credit Rating, Investment Grade [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 153 | 22
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 269 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 422 | 28
Debt Securities, Available-for-sale, Unrealized Loss Position | 3,527 | 2,336
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,596 | 1,747
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,931 | 589
External Credit Rating, Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 144 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 65 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 209 | 4
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,595 | 187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,314 | 152
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 281 | 35
External Credit Rating, Investment Grade [Member] | US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 64 | 6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 148 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 212 | 8
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,455 | 1,544
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1,202 | 1,513
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 253 | 31
External Credit Rating, Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 124 | 3
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 50 | 2
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 174 | 5
Debt Securities, Available-for-sale, Unrealized Loss Position | 950 | 137
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 819 | 109
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 131 | 28
External Credit Rating, Investment Grade [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 253 | 33
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 652 | 37
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 905 | 70
Debt Securities, Available-for-sale, Unrealized Loss Position | 5,477 | 2,961
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2,757 | 2,237
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,720 | 724
External Credit Rating, Non Investment Grade [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 95 | 20
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 130 | 67
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 225 | 87
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,365 | 784
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 858 | 599
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 507 | 185
External Credit Rating, Non Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 87 | 13
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 61 | 44
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 148 | 57
Debt Securities, Available-for-sale, Unrealized Loss Position | 1,072 | 560
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 767 | 463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 305 | 97
External Credit Rating, Non Investment Grade [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 6 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 9 | 13
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 15 | 13
Debt Securities, Available-for-sale, Unrealized Loss Position | 90 | 13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 52 | 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 38 | 13
External Credit Rating, Non Investment Grade [Member] | Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 2 | 7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 60 | 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 62 | 17
Debt Securities, Available-for-sale, Unrealized Loss Position | 203 | 211
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 39 | 136
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | $ 164 | $ 75

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