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Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 38,410 $ 14,280
Other comprehensive income (loss) $ (539) $ (141) (223) (66)
Less: Other comprehensive income attributable to noncontrolling interests 337 (1) 139 (3)
Ending Balance 36,817 16,203 36,817 16,203
Investment Securities, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1 0
Ending Balance 0 0 0 0
Investment Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications     (1) 39
Amounts reclassified from accumulated other comprehensive income (loss)     0 (38)
Deferred taxes     (1) 0
Other comprehensive income (loss)     (2) 1
Investment Securities, Noncontrolling Interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Other comprehensive income attributable to noncontrolling interests     (1) 1
Foreign Currency Translation Adjustment, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (682) (1,795)
Ending Balance (767) (1,869) (767) (1,869)
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications     (224) (63)
Amounts reclassified from accumulated other comprehensive income (loss)     0 0
Deferred taxes     0 (10)
Other comprehensive income (loss)     (224) (73)
Foreign Currency Translation Adjustment, Noncontrolling Interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Other comprehensive income attributable to noncontrolling interests     (139) 1
Cash Flow Hedges, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1 (10)
Ending Balance 2 (1) 2 (1)
Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications     1 2
Amounts reclassified from accumulated other comprehensive income (loss)     0 9
Deferred taxes     0 (2)
Other comprehensive income (loss)     1 9
Cash Flow Hedges, Noncontrolling Interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Other comprehensive income attributable to noncontrolling interests     0 0
Benefit Plans, Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (23) (83)
Ending Balance (22) (87) (22) (87)
Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications     4 (5)
Amounts reclassified from accumulated other comprehensive income (loss)     0 (2)
Deferred taxes     (2) 4
Other comprehensive income (loss)     2 (3)
Benefit Plans, Noncontrolling Interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Other comprehensive income attributable to noncontrolling interests     1 1
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (703) (1,888)
Other comprehensive income (loss)     (84) (69)
Ending Balance $ (787) $ (1,957) (787) (1,957)
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive income (loss) before reclassifications     (220) (27)
Amounts reclassified from accumulated other comprehensive income (loss)     0 (31)
Deferred taxes     (3) (8)
Other comprehensive income (loss)     (223) (66)
Accumulated Other Comprehensive Income (Loss), Noncontrolling Interest        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Less: Other comprehensive income attributable to noncontrolling interests     $ (139) $ 3