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Equity and Noncontrolling Interests - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Foreign currency translation adjustments            
Balance at beginning of period $ (534) $ (1,066) $ (939) $ (785) $ (939)  
Aggregate adjustment for the period (471) 114   (220) (13)  
Aggregate adjustment for period, tax effect 0 0   0 0  
Balance at end of period (1,005) (952) (1,066) (1,005) (952)  
Realized and unrealized gains (losses) on derivatives            
Balance at beginning of period 3 (12) (13) (2) (13)  
Current period change in fair value (8) 12   (3) 8  
Current period change in fair value, Tax (3) 6   (1) 4  
Reclassification to income [1] (2) 2   (2) 7  
Reclassifcation to income, tax effect 0 2   0 [1] 3 [1]  
Balance at end of period (7) 2 (12) (7) 2  
Realized and unrealized gains (losses) on marketable securities            
Balance at beginning of period     8 0 8  
Balance at end of period 0 0   0 0  
Pension and postretirement plans            
Balance at beginning of period (9) (2) (2) (8) (2)  
Reclassification to income 0 0   (1) 0  
Reclassification to income, tax effect 0 0   0 0  
Balance at end of period (9) (2) (2) (9) (2)  
Accumulated other comprehensive loss $ (1,021) $ (952)   (1,021) (952) $ (795)
Adoption of ASU 2016-01            
Realized and unrealized gains (losses) on marketable securities            
Accounting Pronouncement     $ (8) $ 0 [2] 0  
Retained Earnings | Adoption of ASU 2016-01            
Realized and unrealized gains (losses) on marketable securities            
Accounting Pronouncement         8  
AOCI Attributable to Parent [Member] | Adoption of ASU 2016-01            
Realized and unrealized gains (losses) on marketable securities            
Accounting Pronouncement [2]         $ (8)  
[1] Refer to Note 16, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for
disclosure of the line items in the consolidated statements of income affected by reclassifications from AOCI into income
related to derivatives.

[2] During the quarter ended December 31, 2018, the Company adopted ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." As a result, the Company reclassified $8 million of unrealized gains on marketable securities to retained earnings as of October 1, 2018.