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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 52,123 $ 44,049 $ 48,326 $ 45,424
Net other comprehensive income (loss) 1 (48) 20 (62)
Ending balance 53,564 44,554 53,564 44,554
Net Unrealized Gains (Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 21 18 20 14
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 1 1 5
Net other comprehensive income (loss) 0 1 1 5
Less other comprehensive (income) loss attributable to noncontrolling interests 0 0 0 0
Ending balance 21 19 21 19
Net Unrealized Gains (Losses) on Available for Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (55) (25) (69) 5
Other comprehensive income (loss) before reclassifications (11) (30) (2) (60)
Amounts reclassified from AOCI 3 2 8 2
Net other comprehensive income (loss) (8) (28) 6 (58)
Less other comprehensive (income) loss attributable to noncontrolling interests 0 0 0 0
Ending balance (63) (53) (63) (53)
Defined Benefit Pension and Other Benefits Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (100) 25 (101) 25
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 1 0
Net other comprehensive income (loss) 0 0 1 0
Less other comprehensive (income) loss attributable to noncontrolling interests 0 0 0 0
Ending balance (100) 25 (100) 25
Net Unrealized Gains (Losses) on Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (72) (43) (74) (49)
Other comprehensive income (loss) before reclassifications 9 (21) 12 (9)
Amounts reclassified from AOCI 0 0 0 0
Net other comprehensive income (loss) 9 (21) 12 (9)
Less other comprehensive (income) loss attributable to noncontrolling interests (1) 9 (2) 3
Ending balance (64) (55) (64) (55)
Other Comprehensive Income Related to Equity Method Investees        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 6 5 6 5
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Net other comprehensive income (loss) 0 0 0 0
Less other comprehensive (income) loss attributable to noncontrolling interests 0 0 0 0
Ending balance 6 5 6 5
Total        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (200) (20) (218) 0
Other comprehensive income (loss) before reclassifications (2) (51) 10 (69)
Amounts reclassified from AOCI 3 3 10 7
Net other comprehensive income (loss) 1 (48) 20 (62)
Less other comprehensive (income) loss attributable to noncontrolling interests (1) 9 (2) 3
Ending balance (200) (59) (200) (59)
Net unrealized gains (losses) on cash flow hedges. noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance 0 0 0 0
Net unrealized gains (losses) on available for sale securities, noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance 0 0 0 0
Defined benefit pension and other benefits plans, noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance 0 0 0 0
Net unrealized gains (losses) on foreign currency translation, noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance (11) 2 (11) 2
Other comprehensive income (loss) related to equity method investees, noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance 0 0 0 0
Total, noncontrolling interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Ending balance $ (11) $ 2 $ (11) $ 2