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Derivative Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2022
Derivative [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Tax | $ (113,000,000) | $ (4,475,000,000) | $ (2,869,000,000) | $ 1,393,000,000 | $ (7,344,000,000) | $ (11,021,000,000) | $ (9,390,000,000)
Derivatives used in Net Investment Hedge, Net of Tax | 22,000,000 |  |  | 22,000,000 |  |  | 30,000,000
Amount of Ineffectiveness on Net Investment Hedges | 0 | 0 |  | 0 | 0 |  |
Cash flow hedges | Derivatives designated as hedges | Foreign currency swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | 0 | 0 |  | 0 | 0 |  |
Cash flow hedges | Derivatives designated as hedges | Interest rate swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Foreign currency swap gains (losses) | (53,000,000) | 0 |  | (126,000,000) | 0 |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  | 0 |  |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Foreign currency swaps |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net, Recorded in Other Comprehensive Income | (57,000,000) | 65,000,000 |  | 57,000,000 | 9,000,000 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Foreign currency swaps | Investment related gains (losses) |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (43,000,000) | 242,000,000 |  | (102,000,000) | 333,000,000 |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 45,000,000 | (252,000,000) |  | 109,000,000 | (347,000,000) |  |
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | 2,000,000 | (10,000,000) |  | 7,000,000 | (14,000,000) |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 |  | 0 | 0 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach | 0 | 0 |  | 0 | 0 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Foreign currency swaps | Interest sensitive contract liabilities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 57,000,000 |  |  | 57,000,000 |  |  | 88,000,000
Fair Value Hedging [Member] | Derivatives designated as hedges | Interest rate swaps | Investment related gains (losses) |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (120,000,000) | (5,000,000) |  | (18,000,000) | (77,000,000) |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 120,000,000 | 18,000,000 |  | 16,000,000 | 93,000,000 |  |
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | 0 | 13,000,000 |  | (2,000,000) | 16,000,000 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 |  | 0 | 0 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach | 0 | 0 |  | 0 | 0 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Interest rate swaps | Interest sensitive contract liabilities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | 323,000,000 |  |  | 323,000,000 |  |  | 323,000,000
Fair Value Hedging [Member] | Derivatives designated as hedges | Foreign currency forwards |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net, Recorded in Other Comprehensive Income | (61,000,000) | 16,000,000 |  | 2,000,000 | (57,000,000) |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Foreign currency forwards | Investment related gains (losses) |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | (35,000,000) | 201,000,000 |  | (105,000,000) | 328,000,000 |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | 37,000,000 | (232,000,000) |  | 110,000,000 | (358,000,000) |  |
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | 2,000,000 | (31,000,000) |  | 5,000,000 | (30,000,000) |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 3,000,000 | 0 |  | 7,000,000 | 1,000,000 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach | (42,000,000) | 16,000,000 |  | 45,000,000 | 30,000,000 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Net Investment Hedging [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), before Tax | (4,000,000) | 23,000,000 |  | (8,000,000) | 25,000,000 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Cross Currency Interest Rate Contract | Investment related gains (losses) |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 7,000,000 | (335,000,000) |  | 85,000,000 | (494,000,000) |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | (10,000,000) | 298,000,000 |  | (80,000,000) | 495,000,000 |  |
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | (3,000,000) | (37,000,000) |  | 5,000,000 | 1,000,000 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 |  | 0 | 0 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach | 0 | 0 |  | 0 | 0 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Cross Currency Interest Rate Contract | Interest sensitive contract benefits |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments | 13,000,000 | 15,000,000 |  | 28,000,000 | 25,000,000 |  |
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge | (15,000,000) | (14,000,000) |  | (30,000,000) | (23,000,000) |  |
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) | (2,000,000) | 1,000,000 |  | (2,000,000) | 2,000,000 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net | 0 | 0 |  | 0 | 0 |  |
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach | 0 | $ 0 |  | 0 | $ 0 |  |
Fair Value Hedging [Member] | Derivatives designated as hedges | Cross Currency Interest Rate Contract | Interest sensitive contract liabilities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | $ 552,000,000 |  |  | $ 552,000,000 |  |  | $ 632,000,000

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