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Shareholders' Equity (Details 2) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance $ (388)    
Other Comprehensive Income (Loss), Net of Tax (23) $ (54) $ (65)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (411) (388)  
Defined Benefit Plan, Amortization of Gain (Loss) (14) (2)  
Pension settlement charges (4) (3)  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 4 5  
Tax (expense) benefit on reclassification of pension and post-retirement losses to net income 2    
Translation Adjustment and Gains (Losses) From Intra-Entity Transactions of a Long-Term Nature      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (221) (245)  
Amounts classified into OCI, net of tax 39 24  
Amounts reclassified from accumulated OCI, net of tax 0 0  
Other Comprehensive Income (Loss), Net of Tax 39 24  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (182) (221) (245)
Pension and Post-Retirement Benefit Plan Losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance [1] (104) (82)  
Amounts classified into OCI, net of tax (6) (30) [1]  
Amounts reclassified from accumulated OCI, net of tax 14 8 [1]  
Other Comprehensive Income (Loss), Net of Tax 8 (22) [1]  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (96) (104) [1] (82) [1]
Net Unrealized Loss on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance [2] (63) (7)  
Amounts classified into OCI, net of tax (75) (35) [2]  
Amounts reclassified from accumulated OCI, net of tax 5 (21) [2]  
Other Comprehensive Income (Loss), Net of Tax (70) (56) [2]  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (133) (63) [2] (7) [2]
Total      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (388) (334)  
Amounts classified into OCI, net of tax (42) (41)  
Amounts reclassified from accumulated OCI, net of tax 19 (13)  
Other Comprehensive Income (Loss), Net of Tax (23) (54)  
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (411) $ (388) $ (334)
[1] Amounts reclassified from AOCI for pension and post-retirement benefit plans losses during 2020 include amortization of net losses of $14 million, amortization of prior service cost of $4 million and related income tax benefit of $4 million. Amounts reclassified from AOCI for pension and post-retirement benefit plans losses during 2019 include amortization of net losses of $2 million, amortization of prior service cost of $5 million, settlement charges of $3 million and related income tax benefit of $2 million. See Note 15.
[2] See Note 13 for details on amounts reclassified from AOCI.