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Derivative Instruments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Sep. 30, 2022
Dec. 31, 2022
Derivative [Line Items]          
Other Comprehensive Income (Loss), before Tax $ 1,506,000,000 $ (2,869,000,000) $ (7,344,000,000) $ (11,021,000,000) $ (9,390,000,000)
Derivatives used in Net Investment Hedge, Net of Tax 26,000,000       30,000,000
Amount of Ineffectiveness on Net Investment Hedges 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      
Cash flow hedges | Derivatives designated as hedges | Interest rate swaps          
Derivative [Line Items]          
Foreign currency swap gains (losses) (73,000,000) 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 114,000,000 (56,000,000)      
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 (59,000,000) 91,000,000      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 64,000,000 (95,000,000)      
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) 5,000,000 (4,000,000)      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0 0      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach 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) (9,000,000)       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 102,000,000 (72,000,000)      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (104,000,000) 75,000,000      
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) (2,000,000) 3,000,000      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0 0      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach 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) 203,000,000       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 63,000,000 (73,000,000)      
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 (70,000,000) 127,000,000      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge 73,000,000 (126,000,000)      
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) 3,000,000 1,000,000      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 4,000,000 1,000,000      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach 87,000,000 14,000,000      
Fair Value Hedging [Member] | Derivatives designated as hedges | Net Investment Hedging [Member]          
Derivative [Line Items]          
Other Comprehensive Income (Loss), before Tax (4,000,000) 2,000,000      
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 78,000,000 (159,000,000)      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (70,000,000) 197,000,000      
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) 8,000,000 38,000,000      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0 0      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach 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 15,000,000 10,000,000      
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge (15,000,000) (9,000,000)      
Derivative, Fair Value Hedge, Included in Effectiveness, Gain (Loss) 0 1,000,000      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0 0      
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Approach 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) $ 315,000,000       $ 632,000,000