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Contingencies (Other Litigation) (Details) - Other Litigation [Member]
$ in Millions, ₽ in Billions, ₩ in Billions, ฿ in Billions
3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jan. 26, 2017
USD ($)
Jan. 26, 2017
THB (฿)
Jan. 18, 2016
USD ($)
defendant
Jan. 18, 2016
THB (฿)
defendant
Sep. 30, 2019
USD ($)
Sep. 30, 2019
RUB (₽)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
KRW (₩)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
KRW (₩)
Sep. 30, 2019
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
KRW (₩)
Thailand [Member] | The Department of Special Investigations of the Government of Thailand [Member]                          
Loss Contingencies [Line Items]                          
Loss contingency, damages sought, value $ 650 ฿ 19.8                      
Thailand [Member] | The Department of Special Investigations of the Government of Thailand [Member] | Pending Litigation [Member]                          
Loss Contingencies [Line Items]                          
Number of defendants | defendant     8 8                  
Loss contingency, damages sought, value     $ 2,650 ฿ 80.8                  
Korea [Member] | The South Korean Board Of Audit And Inspection [Member]                          
Loss Contingencies [Line Items]                          
Amounts paid             $ 146 ₩ 172 $ 231 ₩ 272   $ 85 ₩ 100
Eastern Europe [Member] | The Moscow Tax Inspectorate for Major Taxpayers Audit [Member]                          
Loss Contingencies [Line Items]                          
Amount of alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest         $ 374 ₽ 24.3              
Amount of pre-tax charge related to alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest         $ 374           $ 374    
Amount of after-tax charge related to alleged underpayment of excise taxes and VAT claimed by tax authority, including penalties and interest                     $ 315